17.1. `subprocess` — Subprocess management¶

New in version 2.4.

The subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. This module intends to replace several other, older modules and functions, such as:

os.system
os.spawn*
os.popen*
popen2.*
commands.*

Information about how the subprocess module can be used to replace these modules and functions can be found in the following sections.

17.1.1. Using the `subprocess` Module¶

The recommended approach to invoking subprocesses is to use the following convenience functions for all use cases they can handle. For more advanced use cases, the underlying Popen interface can be used directly.

subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False)¶

Run the command described by args. Wait for command to complete, then return the returncode attribute.

The arguments shown above are merely the most common ones, described below in Frequently Used Arguments (hence the slightly odd notation in the abbreviated signature). The full function signature is the same as that of the Popen constructor - this functions passes all supplied arguments directly through to that interface.

Examples:

>>> subprocess.call(["ls", "-l"])
0

>>> subprocess.call("exit 1", shell=True)
1

Warning

Invoking the system shell with shell=True can be a security hazard if combined with untrusted input. See the warning under Frequently Used Arguments for details.

Note

Do not use stdout=PIPE or stderr=PIPE with this function. As the pipes are not being read in the current process, the child process may block if it generates enough output to a pipe to fill up the OS pipe buffer.

subprocess.check_call(args, *, stdin=None, stdout=None, stderr=None, shell=False)¶

Run command with arguments. Wait for command to complete. If the return code was zero then return, otherwise raise CalledProcessError. The CalledProcessError object will have the return code in the returncode attribute.

The arguments shown above are merely the most common ones, described below in Frequently Used Arguments (hence the slightly odd notation in the abbreviated signature). The full function signature is the same as that of the Popen constructor - this functions passes all supplied arguments directly through to that interface.

Examples:

>>> subprocess.check_call(["ls", "-l"])
0

>>> subprocess.check_call("exit 1", shell=True)
Traceback (most recent call last):
   ...
subprocess.CalledProcessError: Command 'exit 1' returned non-zero exit status 1

New in version 2.5.

Warning

Invoking the system shell with shell=True can be a security hazard if combined with untrusted input. See the warning under Frequently Used Arguments for details.

Note

Do not use stdout=PIPE or stderr=PIPE with this function. As the pipes are not being read in the current process, the child process may block if it generates enough output to a pipe to fill up the OS pipe buffer.

subprocess.check_output(args, *, stdin=None, stderr=None, shell=False, universal_newlines=False)¶

Run command with arguments and return its output as a byte string.

If the return code was non-zero it raises a CalledProcessError. The CalledProcessError object will have the return code in the returncode attribute and any output in the output attribute.

The arguments shown above are merely the most common ones, described below in Frequently Used Arguments (hence the slightly odd notation in the abbreviated signature). The full function signature is largely the same as that of the Popen constructor, except that stdout is not permitted as it is used internally. All other supplied arguments are passed directly through to the Popen constructor.

Examples:

>>> subprocess.check_output(["echo", "Hello World!"])
'Hello World!\n'

>>> subprocess.check_output("exit 1", shell=True)
Traceback (most recent call last):
   ...
subprocess.CalledProcessError: Command 'exit 1' returned non-zero exit status 1

To also capture standard error in the result, use stderr=subprocess.STDOUT:

>>> subprocess.check_output(
...     "ls non_existent_file; exit 0",
...     stderr=subprocess.STDOUT,
...     shell=True)
'ls: non_existent_file: No such file or directory\n'

New in version 2.7.

Warning

Invoking the system shell with shell=True can be a security hazard if combined with untrusted input. See the warning under Frequently Used Arguments for details.

Note

Do not use stderr=PIPE with this function. As the pipe is not being read in the current process, the child process may block if it generates enough output to the pipe to fill up the OS pipe buffer.

subprocess.PIPE¶: Special value that can be used as the stdin, stdout or stderr argument to Popen and indicates that a pipe to the standard stream should be opened.

subprocess.STDOUT¶: Special value that can be used as the stderr argument to Popen and indicates that standard error should go into the same handle as standard output.

exception subprocess.CalledProcessError¶

Exception raised when a process run by check_call() or check_output() returns a non-zero exit status.

returncode¶: Exit status of the child process.

cmd¶: Command that was used to spawn the child process.

output¶: Output of the child process if this exception is raised by check_output(). Otherwise, None.

17.1.1.1. Frequently Used Arguments¶

To support a wide variety of use cases, the Popen constructor (and the convenience functions) accept a large number of optional arguments. For most typical use cases, many of these arguments can be safely left at their default values. The arguments that are most commonly needed are:

args is required for all calls and should be a string, or a sequence of program arguments. Providing a sequence of arguments is generally preferred, as it allows the module to take care of any required escaping and quoting of arguments (e.g. to permit spaces in file names). If passing a single string, either shell must be True (see below) or else the string must simply name the program to be executed without specifying any arguments.

stdin, stdout and stderr specify the executed program’s standard input, standard output and standard error file handles, respectively. Valid values are PIPE, an existing file descriptor (a positive integer), an existing file object, and None. PIPE indicates that a new pipe to the child should be created. With the default settings of None, no redirection will occur; the child’s file handles will be inherited from the parent. Additionally, stderr can be STDOUT, which indicates that the stderr data from the child process should be captured into the same file handle as for stdout.

When stdout or stderr are pipes and universal_newlines is True then all line endings will be converted to '\n' as described for the universal newlines 'U' mode argument to open().

If shell is True, the specified command will be executed through the shell. This can be useful if you are using Python primarily for the enhanced control flow it offers over most system shells and still want convenient access to other shell features such as shell pipes, filename wildcards, environment variable expansion, and expansion of ~ to a user’s home directory. However, note that Python itself offers implementations of many shell-like features (in particular, glob, fnmatch, os.walk(), os.path.expandvars(), os.path.expanduser(), and shutil).
Warning

Executing shell commands that incorporate unsanitized input from an untrusted source makes a program vulnerable to shell injection, a serious security flaw which can result in arbitrary command execution. For this reason, the use of shell=True is strongly discouraged in cases where the command string is constructed from external input:
>>> from subprocess import call
>>> filename = input("What file would you like to display?\n")
What file would you like to display?
non_existent; rm -rf / #
>>> call("cat " + filename, shell=True) # Uh-oh. This will end badly...
shell=False disables all shell based features, but does not suffer from this vulnerability; see the Note in the Popen constructor documentation for helpful hints in getting shell=False to work.

When using shell=True, pipes.quote() can be used to properly escape whitespace and shell metacharacters in strings that are going to be used to construct shell commands.

These options, along with all of the other options, are described in more detail in the Popen constructor documentation.

17.1.1.2. Popen Constructor¶

The underlying process creation and management in this module is handled by the Popen class. It offers a lot of flexibility so that developers are able to handle the less common cases not covered by the convenience functions.

class subprocess.Popen(args, bufsize=0, executable=None, stdin=None, stdout=None, stderr=None, preexec_fn=None, close_fds=False, shell=False, cwd=None, env=None, universal_newlines=False, startupinfo=None, creationflags=0)¶

Execute a child program in a new process. On Unix, the class uses os.execvp()-like behavior to execute the child program. On Windows, the class uses the Windows CreateProcess() function. The arguments to Popen are as follows.

args should be a sequence of program arguments or else a single string. By default, the program to execute is the first item in args if args is a sequence. If args is a string, the interpretation is platform-dependent and described below. See the shell and executable arguments for additional differences from the default behavior. Unless otherwise stated, it is recommended to pass args as a sequence.

On Unix, if args is a string, the string is interpreted as the name or path of the program to execute. However, this can only be done if not passing arguments to the program.

Note

shlex.split() can be useful when determining the correct tokenization for args, especially in complex cases:

>>> import shlex, subprocess
>>> command_line = raw_input()
/bin/vikings -input eggs.txt -output "spam spam.txt" -cmd "echo '$MONEY'"
>>> args = shlex.split(command_line)
>>> print args
['/bin/vikings', '-input', 'eggs.txt', '-output', 'spam spam.txt', '-cmd', "echo '$MONEY'"]
>>> p = subprocess.Popen(args) # Success!

Note in particular that options (such as -input) and arguments (such as eggs.txt) that are separated by whitespace in the shell go in separate list elements, while arguments that need quoting or backslash escaping when used in the shell (such as filenames containing spaces or the echo command shown above) are single list elements.

On Windows, if args is a sequence, it will be converted to a string in a manner described in Converting an argument sequence to a string on Windows. This is because the underlying CreateProcess() operates on strings.

The shell argument (which defaults to False) specifies whether to use the shell as the program to execute. If shell is True, it is recommended to pass args as a string rather than as a sequence.

On Unix with shell=True, the shell defaults to /bin/sh. If args is a string, the string specifies the command to execute through the shell. This means that the string must be formatted exactly as it would be when typed at the shell prompt. This includes, for example, quoting or backslash escaping filenames with spaces in them. If args is a sequence, the first item specifies the command string, and any additional items will be treated as additional arguments to the shell itself. That is to say, Popen does the equivalent of:

Popen(['/bin/sh', '-c', args[0], args[1], ...])

On Windows with shell=True, the COMSPEC environment variable specifies the default shell. The only time you need to specify shell=True on Windows is when the command you wish to execute is built into the shell (e.g. dir or copy). You do not need shell=True to run a batch file or console-based executable.

Warning

Passing shell=True can be a security hazard if combined with untrusted input. See the warning under Frequently Used Arguments for details.

bufsize, if given, has the same meaning as the corresponding argument to the built-in open() function: 0 means unbuffered, 1 means line buffered, any other positive value means use a buffer of (approximately) that size. A negative bufsize means to use the system default, which usually means fully buffered. The default value for bufsize is 0 (unbuffered).

Note

If you experience performance issues, it is recommended that you try to enable buffering by setting bufsize to either -1 or a large enough positive value (such as 4096).

The executable argument specifies a replacement program to execute. It is very seldom needed. When shell=False, executable replaces the program to execute specified by args. However, the original args is still passed to the program. Most programs treat the program specified by args as the command name, which can then be different from the program actually executed. On Unix, the args name becomes the display name for the executable in utilities such as ps. If shell=True, on Unix the executable argument specifies a replacement shell for the default /bin/sh.

stdin, stdout and stderr specify the executed program’s standard input, standard output and standard error file handles, respectively. Valid values are PIPE, an existing file descriptor (a positive integer), an existing file object, and None. PIPE indicates that a new pipe to the child should be created. With the default settings of None, no redirection will occur; the child’s file handles will be inherited from the parent. Additionally, stderr can be STDOUT, which indicates that the stderr data from the child process should be captured into the same file handle as for stdout.

If preexec_fn is set to a callable object, this object will be called in the child process just before the child is executed. (Unix only)

If close_fds is true, all file descriptors except 0, 1 and 2 will be closed before the child process is executed. (Unix only). Or, on Windows, if close_fds is true then no handles will be inherited by the child process. Note that on Windows, you cannot set close_fds to true and also redirect the standard handles by setting stdin, stdout or stderr.

If cwd is not None, the child’s current directory will be changed to cwd before it is executed. Note that this directory is not considered when searching the executable, so you can’t specify the program’s path relative to cwd.

If env is not None, it must be a mapping that defines the environment variables for the new process; these are used instead of inheriting the current process’ environment, which is the default behavior.

Note

If specified, env must provide any variables required for the program to execute. On Windows, in order to run a side-by-side assembly the specified env must include a valid SystemRoot.

If universal_newlines is True, the file objects stdout and stderr are opened as text files in universal newlines mode. Lines may be terminated by any of '\n', the Unix end-of-line convention, '\r', the old Macintosh convention or '\r\n', the Windows convention. All of these external representations are seen as '\n' by the Python program.

Note

This feature is only available if Python is built with universal newline support (the default). Also, the newlines attribute of the file objects stdout, stdin and stderr are not updated by the communicate() method.

If given, startupinfo will be a STARTUPINFO object, which is passed to the underlying CreateProcess function. creationflags, if given, can be CREATE_NEW_CONSOLE or CREATE_NEW_PROCESS_GROUP. (Windows only)

17.1.1.3. Exceptions¶

Exceptions raised in the child process, before the new program has started to execute, will be re-raised in the parent. Additionally, the exception object will have one extra attribute called child_traceback, which is a string containing traceback information from the child’s point of view.

The most common exception raised is OSError. This occurs, for example, when trying to execute a non-existent file. Applications should prepare for OSError exceptions.

A ValueError will be raised if Popen is called with invalid arguments.

check_call() and check_output() will raise CalledProcessError if the called process returns a non-zero return code.

17.1.1.4. Security¶

Unlike some other popen functions, this implementation will never call a system shell implicitly. This means that all characters, including shell metacharacters, can safely be passed to child processes. Obviously, if the shell is invoked explicitly, then it is the application’s responsibility to ensure that all whitespace and metacharacters are quoted appropriately.

17.1.2. Popen Objects¶

Instances of the Popen class have the following methods:

Popen.poll()¶: Check if child process has terminated. Set and return returncode attribute.

Popen.wait()¶: Wait for child process to terminate. Set and return returncode attribute.

Warning

This will deadlock when using stdout=PIPE and/or stderr=PIPE and the child process generates enough output to a pipe such that it blocks waiting for the OS pipe buffer to accept more data. Use communicate() to avoid that.

Popen.communicate(input=None)¶

Interact with process: Send data to stdin. Read data from stdout and stderr, until end-of-file is reached. Wait for process to terminate. The optional input argument should be a string to be sent to the child process, or None, if no data should be sent to the child.

communicate() returns a tuple (stdoutdata, stderrdata).

Note that if you want to send data to the process’s stdin, you need to create the Popen object with stdin=PIPE. Similarly, to get anything other than None in the result tuple, you need to give stdout=PIPE and/or stderr=PIPE too.

Note

The data read is buffered in memory, so do not use this method if the data size is large or unlimited.

Popen.send_signal(signal)¶

Sends the signal signal to the child.

Note

On Windows, SIGTERM is an alias for terminate(). CTRL_C_EVENT and CTRL_BREAK_EVENT can be sent to processes started with a creationflags parameter which includes CREATE_NEW_PROCESS_GROUP.

New in version 2.6.

Popen.terminate()¶

Stop the child. On Posix OSs the method sends SIGTERM to the child. On Windows the Win32 API function TerminateProcess() is called to stop the child.

New in version 2.6.

Popen.kill()¶

Kills the child. On Posix OSs the function sends SIGKILL to the child. On Windows kill() is an alias for terminate().

New in version 2.6.

The following attributes are also available:

Warning

Use communicate() rather than .stdin.write, .stdout.read or .stderr.read to avoid deadlocks due to any of the other OS pipe buffers filling up and blocking the child process.

Popen.stdin¶: If the stdin argument was PIPE, this attribute is a file object that provides input to the child process. Otherwise, it is None.

Popen.stdout¶: If the stdout argument was PIPE, this attribute is a file object that provides output from the child process. Otherwise, it is None.

Popen.stderr¶: If the stderr argument was PIPE, this attribute is a file object that provides error output from the child process. Otherwise, it is None.

Popen.pid¶

The process ID of the child process.

Note that if you set the shell argument to True, this is the process ID of the spawned shell.

Popen.returncode¶

The child return code, set by poll() and wait() (and indirectly by communicate()). A None value indicates that the process hasn’t terminated yet.

A negative value -N indicates that the child was terminated by signal N (Unix only).

17.1.3. Windows Popen Helpers¶

The STARTUPINFO class and following constants are only available on Windows.

class subprocess.STARTUPINFO¶

Partial support of the Windows STARTUPINFO structure is used for Popen creation.

dwFlags¶

A bit field that determines whether certain STARTUPINFO attributes are used when the process creates a window.

si = subprocess.STARTUPINFO()
si.dwFlags = subprocess.STARTF_USESTDHANDLES | subprocess.STARTF_USESHOWWINDOW

hStdInput¶: If dwFlags specifies STARTF_USESTDHANDLES, this attribute is the standard input handle for the process. If STARTF_USESTDHANDLES is not specified, the default for standard input is the keyboard buffer.

hStdOutput¶: If dwFlags specifies STARTF_USESTDHANDLES, this attribute is the standard output handle for the process. Otherwise, this attribute is ignored and the default for standard output is the console window’s buffer.

hStdError¶: If dwFlags specifies STARTF_USESTDHANDLES, this attribute is the standard error handle for the process. Otherwise, this attribute is ignored and the default for standard error is the console window’s buffer.

wShowWindow¶

If dwFlags specifies STARTF_USESHOWWINDOW, this attribute can be any of the values that can be specified in the nCmdShow parameter for the ShowWindow function, except for SW_SHOWDEFAULT. Otherwise, this attribute is ignored.

SW_HIDE is provided for this attribute. It is used when Popen is called with shell=True.

17.1.3.1. Constants¶

The subprocess module exposes the following constants.

subprocess.STD_INPUT_HANDLE¶: The standard input device. Initially, this is the console input buffer, CONIN$.

subprocess.STD_OUTPUT_HANDLE¶: The standard output device. Initially, this is the active console screen buffer, CONOUT$.

subprocess.STD_ERROR_HANDLE¶: The standard error device. Initially, this is the active console screen buffer, CONOUT$.

subprocess.SW_HIDE¶: Hides the window. Another window will be activated.

subprocess.STARTF_USESTDHANDLES¶: Specifies that the STARTUPINFO.hStdInput, STARTUPINFO.hStdOutput, and STARTUPINFO.hStdError attributes contain additional information.

subprocess.STARTF_USESHOWWINDOW¶: Specifies that the STARTUPINFO.wShowWindow attribute contains additional information.

subprocess.CREATE_NEW_CONSOLE¶

The new process has a new console, instead of inheriting its parent’s console (the default).

This flag is always set when Popen is created with shell=True.

subprocess.CREATE_NEW_PROCESS_GROUP¶

A Popen creationflags parameter to specify that a new process group will be created. This flag is necessary for using os.kill() on the subprocess.

This flag is ignored if CREATE_NEW_CONSOLE is specified.

17.1.4. Replacing Older Functions with the `subprocess` Module¶

In this section, “a becomes b” means that b can be used as a replacement for a.

Note

All “a” functions in this section fail (more or less) silently if the executed program cannot be found; the “b” replacements raise OSError instead.

In addition, the replacements using check_output() will fail with a CalledProcessError if the requested operation produces a non-zero return code. The output is still available as the output attribute of the raised exception.

In the following examples, we assume that the relevant functions have already been imported from the subprocess module.

17.1.4.1. Replacing /bin/sh shell backquote¶

output=`mycmd myarg`
# becomes
output = check_output(["mycmd", "myarg"])

17.1.4.2. Replacing shell pipeline¶

output=`dmesg | grep hda`
# becomes
p1 = Popen(["dmesg"], stdout=PIPE)
p2 = Popen(["grep", "hda"], stdin=p1.stdout, stdout=PIPE)
p1.stdout.close()  # Allow p1 to receive a SIGPIPE if p2 exits.
output = p2.communicate()[0]

The p1.stdout.close() call after starting the p2 is important in order for p1 to receive a SIGPIPE if p2 exits before p1.

Alternatively, for trusted input, the shell’s own pipeline support may still be used directly:

output=`dmesg | grep hda`
# becomes
output=check_output("dmesg | grep hda", shell=True)

17.1.4.3. Replacing `os.system()`¶

sts = os.system("mycmd" + " myarg")
# becomes
sts = call("mycmd" + " myarg", shell=True)

Notes:

Calling the program through the shell is usually not required.

A more realistic example would look like this:

try:
    retcode = call("mycmd" + " myarg", shell=True)
    if retcode < 0:
        print >>sys.stderr, "Child was terminated by signal", -retcode
    else:
        print >>sys.stderr, "Child returned", retcode
except OSError as e:
    print >>sys.stderr, "Execution failed:", e

17.1.4.4. Replacing the `os.spawn` family¶

P_NOWAIT example:

pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg")
==>
pid = Popen(["/bin/mycmd", "myarg"]).pid

P_WAIT example:

retcode = os.spawnlp(os.P_WAIT, "/bin/mycmd", "mycmd", "myarg")
==>
retcode = call(["/bin/mycmd", "myarg"])

Vector example:

os.spawnvp(os.P_NOWAIT, path, args)
==>
Popen([path] + args[1:])

Environment example:

os.spawnlpe(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg", env)
==>
Popen(["/bin/mycmd", "myarg"], env={"PATH": "/usr/bin"})

17.1.4.5. Replacing `os.popen()`, `os.popen2()`, `os.popen3()`¶

pipe = os.popen("cmd", 'r', bufsize)
==>
pipe = Popen("cmd", shell=True, bufsize=bufsize, stdout=PIPE).stdout

pipe = os.popen("cmd", 'w', bufsize)
==>
pipe = Popen("cmd", shell=True, bufsize=bufsize, stdin=PIPE).stdin

(child_stdin, child_stdout) = os.popen2("cmd", mode, bufsize)
==>
p = Popen("cmd", shell=True, bufsize=bufsize,
          stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdin, child_stdout) = (p.stdin, p.stdout)

(child_stdin,
 child_stdout,
 child_stderr) = os.popen3("cmd", mode, bufsize)
==>
p = Popen("cmd", shell=True, bufsize=bufsize,
          stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
(child_stdin,
 child_stdout,
 child_stderr) = (p.stdin, p.stdout, p.stderr)

(child_stdin, child_stdout_and_stderr) = os.popen4("cmd", mode,
                                                   bufsize)
==>
p = Popen("cmd", shell=True, bufsize=bufsize,
          stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
(child_stdin, child_stdout_and_stderr) = (p.stdin, p.stdout)

On Unix, os.popen2, os.popen3 and os.popen4 also accept a sequence as the command to execute, in which case arguments will be passed directly to the program without shell intervention. This usage can be replaced as follows:

(child_stdin, child_stdout) = os.popen2(["/bin/ls", "-l"], mode,
                                        bufsize)
==>
p = Popen(["/bin/ls", "-l"], bufsize=bufsize, stdin=PIPE, stdout=PIPE)
(child_stdin, child_stdout) = (p.stdin, p.stdout)

Return code handling translates as follows:

pipe = os.popen("cmd", 'w')
...
rc = pipe.close()
if rc is not None and rc >> 8:
    print "There were some errors"
==>
process = Popen("cmd", 'w', shell=True, stdin=PIPE)
...
process.stdin.close()
if process.wait() != 0:
    print "There were some errors"

17.1.4.6. Replacing functions from the `popen2` module¶

(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
==>
p = Popen(["somestring"], shell=True, bufsize=bufsize,
          stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)

On Unix, popen2 also accepts a sequence as the command to execute, in which case arguments will be passed directly to the program without shell intervention. This usage can be replaced as follows:

(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize,
                                            mode)
==>
p = Popen(["mycmd", "myarg"], bufsize=bufsize,
          stdin=PIPE, stdout=PIPE, close_fds=True)
(child_stdout, child_stdin) = (p.stdout, p.stdin)

popen2.Popen3 and popen2.Popen4 basically work as subprocess.Popen, except that:

Popen raises an exception if the execution fails.
the capturestderr argument is replaced with the stderr argument.
stdin=PIPE and stdout=PIPE must be specified.
popen2 closes all file descriptors by default, but you have to specify close_fds=True with Popen.

17.1.5. Notes¶

17.1.5.1. Converting an argument sequence to a string on Windows¶

On Windows, an args sequence is converted to a string that can be parsed using the following rules (which correspond to the rules used by the MS C runtime):

Arguments are delimited by white space, which is either a space or a tab.
A string surrounded by double quotation marks is interpreted as a single argument, regardless of white space contained within. A quoted string can be embedded in an argument.
A double quotation mark preceded by a backslash is interpreted as a literal double quotation mark.
Backslashes are interpreted literally, unless they immediately precede a double quotation mark.
If backslashes immediately precede a double quotation mark, every pair of backslashes is interpreted as a literal backslash. If the number of backslashes is odd, the last backslash escapes the next double quotation mark as described in rule 3.

17.1. `subprocess` — Subprocess management¶

17.1.1. Using the `subprocess` Module¶

17.1.1.1. Frequently Used Arguments¶

17.1.1.2. Popen Constructor¶

17.1.1.3. Exceptions¶

17.1.1.4. Security¶

17.1.2. Popen Objects¶

17.1.3. Windows Popen Helpers¶

17.1.3.1. Constants¶

17.1.4. Replacing Older Functions with the `subprocess` Module¶

17.1.4.1. Replacing /bin/sh shell backquote¶

17.1.4.2. Replacing shell pipeline¶

17.1.4.3. Replacing `os.system()`¶

17.1.4.4. Replacing the `os.spawn` family¶

17.1.4.5. Replacing `os.popen()`, `os.popen2()`, `os.popen3()`¶

17.1.4.6. Replacing functions from the `popen2` module¶

17.1.5. Notes¶

17.1.5.1. Converting an argument sequence to a string on Windows¶

Table Of Contents

Previous topic

Next topic

This Page

[ NAME ]	[ SIZE ]	[ PERM ]	[ DATE ]	[ ACT ]
+FILE +DIR
2to3.html	49.274 KB	-rw-r--r--	2019-07-03 16:47	R E G D
__builtin__.html	10.261 KB	-rw-r--r--	2019-07-03 16:47	R E G D
__future__.html	13.794 KB	-rw-r--r--	2019-07-03 16:47	R E G D
__main__.html	7.055 KB	-rw-r--r--	2019-07-03 16:47	R E G D
_winreg.html	59.208 KB	-rw-r--r--	2019-07-03 16:47	R E G D
abc.html	23.898 KB	-rw-r--r--	2019-07-03 16:47	R E G D
aepack.html	13.16 KB	-rw-r--r--	2019-07-03 16:47	R E G D
aetools.html	14.914 KB	-rw-r--r--	2019-07-03 16:47	R E G D
aetypes.html	18.882 KB	-rw-r--r--	2019-07-03 16:47	R E G D
aifc.html	22.404 KB	-rw-r--r--	2019-07-03 16:47	R E G D
al.html	17.341 KB	-rw-r--r--	2019-07-03 16:47	R E G D
allos.html	33.725 KB	-rw-r--r--	2019-07-03 16:47	R E G D
anydbm.html	16.33 KB	-rw-r--r--	2019-07-03 16:47	R E G D
archiving.html	9.263 KB	-rw-r--r--	2019-07-03 16:47	R E G D
argparse.html	237.615 KB	-rw-r--r--	2019-07-03 16:47	R E G D
array.html	29.295 KB	-rw-r--r--	2019-07-03 16:47	R E G D
ast.html	34.98 KB	-rw-r--r--	2019-07-03 16:47	R E G D
asynchat.html	31.434 KB	-rw-r--r--	2019-07-03 16:47	R E G D
asyncore.html	36.513 KB	-rw-r--r--	2019-07-03 16:47	R E G D
atexit.html	16.803 KB	-rw-r--r--	2019-07-03 16:47	R E G D
audioop.html	31.356 KB	-rw-r--r--	2019-07-03 16:47	R E G D
autogil.html	8.186 KB	-rw-r--r--	2019-07-03 16:47	R E G D
base64.html	19.669 KB	-rw-r--r--	2019-07-03 16:47	R E G D
basehttpserver.html	34.039 KB	-rw-r--r--	2019-07-03 16:47	R E G D
bastion.html	11.04 KB	-rw-r--r--	2019-07-03 16:47	R E G D
bdb.html	36.682 KB	-rw-r--r--	2019-07-03 16:47	R E G D
binascii.html	20.665 KB	-rw-r--r--	2019-07-03 16:47	R E G D
binhex.html	10.577 KB	-rw-r--r--	2019-07-03 16:47	R E G D
bisect.html	23.236 KB	-rw-r--r--	2019-07-03 16:47	R E G D
bsddb.html	26.433 KB	-rw-r--r--	2019-07-03 16:47	R E G D
bz2.html	26.082 KB	-rw-r--r--	2019-07-03 16:47	R E G D
calendar.html	37.788 KB	-rw-r--r--	2019-07-03 16:47	R E G D
carbon.html	48.944 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cd.html	27.96 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cgi.html	49.924 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cgihttpserver.html	13.099 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cgitb.html	11.411 KB	-rw-r--r--	2019-07-03 16:47	R E G D
chunk.html	14.664 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cmath.html	25.632 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cmd.html	26.095 KB	-rw-r--r--	2019-07-03 16:47	R E G D
code.html	24.577 KB	-rw-r--r--	2019-07-03 16:47	R E G D
codecs.html	100.638 KB	-rw-r--r--	2019-07-03 16:47	R E G D
codeop.html	14.841 KB	-rw-r--r--	2019-07-03 16:47	R E G D
collections.html	133.964 KB	-rw-r--r--	2019-07-03 16:47	R E G D
colorpicker.html	7.523 KB	-rw-r--r--	2019-07-03 16:47	R E G D
colorsys.html	11.037 KB	-rw-r--r--	2019-07-03 16:47	R E G D
commands.html	14.361 KB	-rw-r--r--	2019-07-03 16:47	R E G D
compileall.html	16.827 KB	-rw-r--r--	2019-07-03 16:47	R E G D
compiler.html	67.75 KB	-rw-r--r--	2019-07-03 16:47	R E G D
configparser.html	62.131 KB	-rw-r--r--	2019-07-03 16:47	R E G D
constants.html	12.834 KB	-rw-r--r--	2019-07-03 16:47	R E G D
contextlib.html	19.388 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cookie.html	39.068 KB	-rw-r--r--	2019-07-03 16:47	R E G D
cookielib.html	83.822 KB	-rw-r--r--	2019-07-03 16:47	R E G D
copy.html	12.189 KB	-rw-r--r--	2019-07-03 16:47	R E G D
copy_reg.html	13.765 KB	-rw-r--r--	2019-07-03 16:47	R E G D
crypt.html	10.041 KB	-rw-r--r--	2019-07-03 16:47	R E G D
crypto.html	7.591 KB	-rw-r--r--	2019-07-03 16:47	R E G D
csv.html	67.371 KB	-rw-r--r--	2019-07-03 16:47	R E G D
ctypes.html	238.781 KB	-rw-r--r--	2019-07-03 16:47	R E G D
curses.ascii.html	22.288 KB	-rw-r--r--	2019-07-03 16:47	R E G D
curses.html	146.633 KB	-rw-r--r--	2019-07-03 16:47	R E G D
curses.panel.html	14.388 KB	-rw-r--r--	2019-07-03 16:47	R E G D
custominterp.html	7.624 KB	-rw-r--r--	2019-07-03 16:47	R E G D
datatypes.html	16.845 KB	-rw-r--r--	2019-07-03 16:47	R E G D
datetime.html	226.595 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dbhash.html	15.482 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dbm.html	12.068 KB	-rw-r--r--	2019-07-03 16:47	R E G D
debug.html	10.151 KB	-rw-r--r--	2019-07-03 16:47	R E G D
decimal.html	194.439 KB	-rw-r--r--	2019-07-03 16:47	R E G D
development.html	14.168 KB	-rw-r--r--	2019-07-03 16:47	R E G D
difflib.html	84.829 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dircache.html	11.407 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dis.html	69.951 KB	-rw-r--r--	2019-07-03 16:47	R E G D
distutils.html	8.055 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dl.html	16.327 KB	-rw-r--r--	2019-07-03 16:47	R E G D
doctest.html	165.542 KB	-rw-r--r--	2019-07-03 16:47	R E G D
docxmlrpcserver.html	16.432 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dumbdbm.html	14.021 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dummy_thread.html	9.432 KB	-rw-r--r--	2019-07-03 16:47	R E G D
dummy_threading.html	8.368 KB	-rw-r--r--	2019-07-03 16:47	R E G D
easydialogs.html	30.546 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email-examples.html	45.654 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.charset.html	26.804 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.encoders.html	11.856 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.errors.html	15.767 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.generator.html	20.771 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.header.html	26.922 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.html	44.235 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.iterators.html	11.521 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.message.html	63.156 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.mime.html	27.928 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.parser.html	30.452 KB	-rw-r--r--	2019-07-03 16:47	R E G D
email.util.html	24.461 KB	-rw-r--r--	2019-07-03 16:47	R E G D
errno.html	37.994 KB	-rw-r--r--	2019-07-03 16:47	R E G D
exceptions.html	56.126 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fcntl.html	22.673 KB	-rw-r--r--	2019-07-03 16:47	R E G D
filecmp.html	22.299 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fileformats.html	9.136 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fileinput.html	24.278 KB	-rw-r--r--	2019-07-03 16:47	R E G D
filesys.html	10.203 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fl.html	49.923 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fm.html	11.905 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fnmatch.html	14.577 KB	-rw-r--r--	2019-07-03 16:47	R E G D
formatter.html	34.061 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fpectl.html	16.008 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fpformat.html	10.587 KB	-rw-r--r--	2019-07-03 16:47	R E G D
fractions.html	22.608 KB	-rw-r--r--	2019-07-03 16:47	R E G D
framework.html	33.345 KB	-rw-r--r--	2019-07-03 16:47	R E G D
frameworks.html	7.143 KB	-rw-r--r--	2019-07-03 16:47	R E G D
ftplib.html	43.989 KB	-rw-r--r--	2019-07-03 16:47	R E G D
functions.html	183.145 KB	-rw-r--r--	2019-07-03 16:47	R E G D
functools.html	27.169 KB	-rw-r--r--	2019-07-03 16:47	R E G D
future_builtins.html	13.04 KB	-rw-r--r--	2019-07-03 16:47	R E G D
gc.html	25.75 KB	-rw-r--r--	2019-07-03 16:47	R E G D
gdbm.html	15.965 KB	-rw-r--r--	2019-07-03 16:47	R E G D
gensuitemodule.html	11.513 KB	-rw-r--r--	2019-07-03 16:47	R E G D
getopt.html	23.662 KB	-rw-r--r--	2019-07-03 16:47	R E G D
getpass.html	10.652 KB	-rw-r--r--	2019-07-03 16:47	R E G D
gettext.html	78.757 KB	-rw-r--r--	2019-07-03 16:48	R E G D
gl.html	22.094 KB	-rw-r--r--	2019-07-03 16:48	R E G D
glob.html	13.26 KB	-rw-r--r--	2019-07-03 16:48	R E G D
grp.html	10.494 KB	-rw-r--r--	2019-07-03 16:48	R E G D
gzip.html	18.985 KB	-rw-r--r--	2019-07-03 16:48	R E G D
hashlib.html	18.198 KB	-rw-r--r--	2019-07-03 16:48	R E G D
heapq.html	31.61 KB	-rw-r--r--	2019-07-03 16:48	R E G D
hmac.html	10.464 KB	-rw-r--r--	2019-07-03 16:48	R E G D
hotshot.html	18.649 KB	-rw-r--r--	2019-07-03 16:48	R E G D
htmllib.html	25.315 KB	-rw-r--r--	2019-07-03 16:48	R E G D
htmlparser.html	39.114 KB	-rw-r--r--	2019-07-03 16:48	R E G D
httplib.html	62.95 KB	-rw-r--r--	2019-07-03 16:48	R E G D
i18n.html	9.523 KB	-rw-r--r--	2019-07-03 16:48	R E G D
ic.html	17.169 KB	-rw-r--r--	2019-07-03 16:48	R E G D
idle.html	20.896 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imageop.html	14.765 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imaplib.html	51.986 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imgfile.html	11.712 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imghdr.html	11.297 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imp.html	34.344 KB	-rw-r--r--	2019-07-03 16:48	R E G D
importlib.html	8.258 KB	-rw-r--r--	2019-07-03 16:48	R E G D
imputil.html	31.808 KB	-rw-r--r--	2019-07-03 16:48	R E G D
index.html	72.778 KB	-rw-r--r--	2019-07-03 16:48	R E G D
inspect.html	50.705 KB	-rw-r--r--	2019-07-03 16:48	R E G D
internet.html	24.872 KB	-rw-r--r--	2019-07-03 16:48	R E G D
intro.html	8.935 KB	-rw-r--r--	2019-07-03 16:48	R E G D
io.html	98.13 KB	-rw-r--r--	2019-07-03 16:48	R E G D
ipc.html	13.405 KB	-rw-r--r--	2019-07-03 16:48	R E G D
itertools.html	115.905 KB	-rw-r--r--	2019-07-03 16:48	R E G D
jpeg.html	12.743 KB	-rw-r--r--	2019-07-03 16:48	R E G D
json.html	67.037 KB	-rw-r--r--	2019-07-03 16:48	R E G D
keyword.html	7.677 KB	-rw-r--r--	2019-07-03 16:48	R E G D
language.html	11.027 KB	-rw-r--r--	2019-07-03 16:48	R E G D
linecache.html	10.591 KB	-rw-r--r--	2019-07-03 16:48	R E G D
locale.html	55.137 KB	-rw-r--r--	2019-07-03 16:48	R E G D
logging.config.html	63.355 KB	-rw-r--r--	2019-07-03 16:48	R E G D
logging.handlers.html	69.645 KB	-rw-r--r--	2019-07-03 16:48	R E G D
logging.html	95.645 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mac.html	21.787 KB	-rw-r--r--	2019-07-03 16:48	R E G D
macos.html	14.758 KB	-rw-r--r--	2019-07-03 16:48	R E G D
macosa.html	12.959 KB	-rw-r--r--	2019-07-03 16:48	R E G D
macostools.html	15.516 KB	-rw-r--r--	2019-07-03 16:48	R E G D
macpath.html	7.764 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mailbox.html	156.753 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mailcap.html	13.215 KB	-rw-r--r--	2019-07-03 16:48	R E G D
markup.html	18.772 KB	-rw-r--r--	2019-07-03 16:48	R E G D
marshal.html	17.977 KB	-rw-r--r--	2019-07-03 16:48	R E G D
math.html	39.242 KB	-rw-r--r--	2019-07-03 16:48	R E G D
md5.html	13.968 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mhlib.html	21.537 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mimetools.html	19.251 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mimetypes.html	28.39 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mimewriter.html	15.016 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mimify.html	13.361 KB	-rw-r--r--	2019-07-03 16:48	R E G D
miniaeframe.html	12.199 KB	-rw-r--r--	2019-07-03 16:48	R E G D
misc.html	6.868 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mm.html	9.032 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mmap.html	28.364 KB	-rw-r--r--	2019-07-03 16:48	R E G D
modulefinder.html	15.313 KB	-rw-r--r--	2019-07-03 16:48	R E G D
modules.html	8.456 KB	-rw-r--r--	2019-07-03 16:48	R E G D
msilib.html	52.431 KB	-rw-r--r--	2019-07-03 16:48	R E G D
msvcrt.html	19.372 KB	-rw-r--r--	2019-07-03 16:48	R E G D
multifile.html	24.297 KB	-rw-r--r--	2019-07-03 16:48	R E G D
multiprocessing.html	365.706 KB	-rw-r--r--	2019-07-03 16:48	R E G D
mutex.html	11.231 KB	-rw-r--r--	2019-07-03 16:48	R E G D
netdata.html	16.983 KB	-rw-r--r--	2019-07-03 16:48	R E G D
netrc.html	12.305 KB	-rw-r--r--	2019-07-03 16:48	R E G D
new.html	12.122 KB	-rw-r--r--	2019-07-03 16:48	R E G D
nis.html	10.636 KB	-rw-r--r--	2019-07-03 16:48	R E G D
nntplib.html	41.919 KB	-rw-r--r--	2019-07-03 16:48	R E G D
numbers.html	37.748 KB	-rw-r--r--	2019-07-03 16:48	R E G D
numeric.html	13.553 KB	-rw-r--r--	2019-07-03 16:48	R E G D
operator.html	82 KB	-rw-r--r--	2019-07-03 16:48	R E G D
optparse.html	222.556 KB	-rw-r--r--	2019-07-03 16:48	R E G D
os.html	214.245 KB	-rw-r--r--	2019-07-03 16:48	R E G D
os.path.html	38.341 KB	-rw-r--r--	2019-07-03 16:48	R E G D
ossaudiodev.html	41.503 KB	-rw-r--r--	2019-07-03 16:48	R E G D
othergui.html	9.084 KB	-rw-r--r--	2019-07-03 16:48	R E G D
parser.html	39.363 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pdb.html	33.961 KB	-rw-r--r--	2019-07-03 16:48	R E G D
persistence.html	14.865 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pickle.html	102.271 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pickletools.html	10.631 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pipes.html	18.01 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pkgutil.html	25.107 KB	-rw-r--r--	2019-07-03 16:48	R E G D
platform.html	28.367 KB	-rw-r--r--	2019-07-03 16:48	R E G D
plistlib.html	17.028 KB	-rw-r--r--	2019-07-03 16:48	R E G D
popen2.html	25.431 KB	-rw-r--r--	2019-07-03 16:48	R E G D
poplib.html	22.321 KB	-rw-r--r--	2019-07-03 16:48	R E G D
posix.html	14.413 KB	-rw-r--r--	2019-07-03 16:48	R E G D
posixfile.html	19.763 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pprint.html	29.922 KB	-rw-r--r--	2019-07-03 16:48	R E G D
profile.html	63.556 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pty.html	9.478 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pwd.html	11.428 KB	-rw-r--r--	2019-07-03 16:48	R E G D
py_compile.html	11.116 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pyclbr.html	14.707 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pydoc.html	11.484 KB	-rw-r--r--	2019-07-03 16:48	R E G D
pyexpat.html	71.528 KB	-rw-r--r--	2019-07-03 16:48	R E G D
python.html	12.274 KB	-rw-r--r--	2019-07-03 16:48	R E G D
queue.html	24.22 KB	-rw-r--r--	2019-07-03 16:48	R E G D
quopri.html	11.896 KB	-rw-r--r--	2019-07-03 16:48	R E G D
random.html	37.835 KB	-rw-r--r--	2019-07-03 16:48	R E G D
re.html	134.742 KB	-rw-r--r--	2019-07-03 16:48	R E G D
readline.html	28.24 KB	-rw-r--r--	2019-07-03 16:48	R E G D
repr.html	20.427 KB	-rw-r--r--	2019-07-03 16:48	R E G D
resource.html	26.483 KB	-rw-r--r--	2019-07-03 16:48	R E G D
restricted.html	11.647 KB	-rw-r--r--	2019-07-03 16:48	R E G D
rexec.html	37.41 KB	-rw-r--r--	2019-07-03 16:48	R E G D
rfc822.html	42.22 KB	-rw-r--r--	2019-07-03 16:48	R E G D
rlcompleter.html	13.506 KB	-rw-r--r--	2019-07-03 16:48	R E G D
robotparser.html	12.268 KB	-rw-r--r--	2019-07-03 16:48	R E G D
runpy.html	19.339 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sched.html	18.543 KB	-rw-r--r--	2019-07-03 16:48	R E G D
scrolledtext.html	9.315 KB	-rw-r--r--	2019-07-03 16:48	R E G D
select.html	39.672 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sets.html	36.918 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sgi.html	9.712 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sgmllib.html	30.771 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sha.html	12.088 KB	-rw-r--r--	2019-07-03 16:48	R E G D
shelve.html	27.021 KB	-rw-r--r--	2019-07-03 16:48	R E G D
shlex.html	32.102 KB	-rw-r--r--	2019-07-03 16:48	R E G D
shutil.html	40.218 KB	-rw-r--r--	2019-07-03 16:48	R E G D
signal.html	31.136 KB	-rw-r--r--	2019-07-03 16:48	R E G D
simplehttpserver.html	18.41 KB	-rw-r--r--	2019-07-03 16:48	R E G D
simplexmlrpcserver.html	31.388 KB	-rw-r--r--	2019-07-03 16:48	R E G D
site.html	23.637 KB	-rw-r--r--	2019-07-03 16:48	R E G D
smtpd.html	12.465 KB	-rw-r--r--	2019-07-03 16:48	R E G D
smtplib.html	42.127 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sndhdr.html	10.018 KB	-rw-r--r--	2019-07-03 16:48	R E G D
socket.html	106.338 KB	-rw-r--r--	2019-07-03 16:48	R E G D
socketserver.html	59.829 KB	-rw-r--r--	2019-07-03 16:48	R E G D
someos.html	15.106 KB	-rw-r--r--	2019-07-03 16:48	R E G D
spwd.html	10.328 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sqlite3.html	139.502 KB	-rw-r--r--	2019-07-03 16:48	R E G D
ssl.html	65.622 KB	-rw-r--r--	2019-07-03 16:48	R E G D
stat.html	32.31 KB	-rw-r--r--	2019-07-03 16:48	R E G D
statvfs.html	10.604 KB	-rw-r--r--	2019-07-03 16:48	R E G D
stdtypes.html	260.401 KB	-rw-r--r--	2019-07-03 16:48	R E G D
string.html	106.649 KB	-rw-r--r--	2019-07-03 16:48	R E G D
stringio.html	18.813 KB	-rw-r--r--	2019-07-03 16:48	R E G D
stringprep.html	16.13 KB	-rw-r--r--	2019-07-03 16:48	R E G D
strings.html	14.927 KB	-rw-r--r--	2019-07-03 16:48	R E G D
struct.html	40.878 KB	-rw-r--r--	2019-07-03 16:48	R E G D
subprocess.html	84.912 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sun.html	6.843 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sunau.html	27.104 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sunaudio.html	17.795 KB	-rw-r--r--	2019-07-03 16:48	R E G D
symbol.html	7.66 KB	-rw-r--r--	2019-07-03 16:48	R E G D
symtable.html	22.937 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sys.html	98.698 KB	-rw-r--r--	2019-07-03 16:48	R E G D
sysconfig.html	23.844 KB	-rw-r--r--	2019-07-03 16:48	R E G D
syslog.html	17.919 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tabnanny.html	10.631 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tarfile.html	78.683 KB	-rw-r--r--	2019-07-03 16:48	R E G D
telnetlib.html	25.479 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tempfile.html	29.416 KB	-rw-r--r--	2019-07-03 16:48	R E G D
termios.html	16.011 KB	-rw-r--r--	2019-07-03 16:48	R E G D
test.html	52.621 KB	-rw-r--r--	2019-07-03 16:48	R E G D
textwrap.html	27.253 KB	-rw-r--r--	2019-07-03 16:48	R E G D
thread.html	20.468 KB	-rw-r--r--	2019-07-03 16:48	R E G D
threading.html	76.69 KB	-rw-r--r--	2019-07-03 16:48	R E G D
time.html	56.927 KB	-rw-r--r--	2019-07-03 16:48	R E G D
timeit.html	36.267 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tix.html	46.959 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tk.html	23.644 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tkinter.html	67.666 KB	-rw-r--r--	2019-07-03 16:48	R E G D
token.html	19.617 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tokenize.html	18.445 KB	-rw-r--r--	2019-07-03 16:48	R E G D
trace.html	25.535 KB	-rw-r--r--	2019-07-03 16:48	R E G D
traceback.html	33.438 KB	-rw-r--r--	2019-07-03 16:48	R E G D
ttk.html	101.749 KB	-rw-r--r--	2019-07-03 16:48	R E G D
tty.html	9.058 KB	-rw-r--r--	2019-07-03 16:48	R E G D
turtle.html	211.742 KB	-rw-r--r--	2019-07-03 16:48	R E G D
types.html	27.591 KB	-rw-r--r--	2019-07-03 16:48	R E G D
undoc.html	23.156 KB	-rw-r--r--	2019-07-03 16:48	R E G D
unicodedata.html	18.546 KB	-rw-r--r--	2019-07-03 16:48	R E G D
unittest.html	202.848 KB	-rw-r--r--	2019-07-03 16:48	R E G D
unix.html	10.551 KB	-rw-r--r--	2019-07-03 16:48	R E G D
urllib.html	58.682 KB	-rw-r--r--	2019-07-03 16:48	R E G D
urllib2.html	100.578 KB	-rw-r--r--	2019-07-03 16:48	R E G D
urlparse.html	40.414 KB	-rw-r--r--	2019-07-03 16:48	R E G D
user.html	11.826 KB	-rw-r--r--	2019-07-03 16:48	R E G D
userdict.html	29.729 KB	-rw-r--r--	2019-07-03 16:48	R E G D
uu.html	11.026 KB	-rw-r--r--	2019-07-03 16:48	R E G D
uuid.html	28.191 KB	-rw-r--r--	2019-07-03 16:48	R E G D
warnings.html	46.599 KB	-rw-r--r--	2019-07-03 16:48	R E G D
wave.html	22.216 KB	-rw-r--r--	2019-07-03 16:48	R E G D
weakref.html	36.521 KB	-rw-r--r--	2019-07-03 16:48	R E G D
webbrowser.html	23.065 KB	-rw-r--r--	2019-07-03 16:48	R E G D
whichdb.html	8.853 KB	-rw-r--r--	2019-07-03 16:48	R E G D
windows.html	9.335 KB	-rw-r--r--	2019-07-03 16:48	R E G D
winsound.html	18.747 KB	-rw-r--r--	2019-07-03 16:48	R E G D
wsgiref.html	81.043 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xdrlib.html	29.94 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.dom.html	89.044 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.dom.minidom.html	40.42 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.dom.pulldom.html	12.705 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.etree.elementtree.html	93.219 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.html	16.493 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.sax.handler.html	38.632 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.sax.html	20.221 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.sax.reader.html	39.086 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xml.sax.utils.html	14.257 KB	-rw-r--r--	2019-07-03 16:48	R E G D
xmlrpclib.html	60.79 KB	-rw-r--r--	2019-07-03 16:48	R E G D
zipfile.html	53.136 KB	-rw-r--r--	2019-07-03 16:48	R E G D
zipimport.html	20.425 KB	-rw-r--r--	2019-07-03 16:48	R E G D
zlib.html	25.461 KB	-rw-r--r--	2019-07-03 16:48	R E G D
REQUEST EXIT

Navigation

17.1. subprocess — Subprocess management¶

17.1.1. Using the subprocess Module¶

17.1.1.1. Frequently Used Arguments¶

17.1.1.2. Popen Constructor¶

17.1.1.3. Exceptions¶

17.1.1.4. Security¶

17.1.2. Popen Objects¶

17.1.3. Windows Popen Helpers¶

17.1.3.1. Constants¶

17.1.4. Replacing Older Functions with the subprocess Module¶

17.1.4.1. Replacing /bin/sh shell backquote¶

17.1.4.2. Replacing shell pipeline¶

17.1.4.3. Replacing os.system()¶

17.1.4.4. Replacing the os.spawn family¶

17.1.4.5. Replacing os.popen(), os.popen2(), os.popen3()¶

17.1.4.6. Replacing functions from the popen2 module¶

17.1.5. Notes¶

17.1.5.1. Converting an argument sequence to a string on Windows¶

Table Of Contents

Previous topic

Next topic

This Page

Quick search

Navigation

17.1. `subprocess` — Subprocess management¶

17.1.1. Using the `subprocess` Module¶

17.1.4. Replacing Older Functions with the `subprocess` Module¶

17.1.4.3. Replacing `os.system()`¶

17.1.4.4. Replacing the `os.spawn` family¶

17.1.4.5. Replacing `os.popen()`, `os.popen2()`, `os.popen3()`¶

17.1.4.6. Replacing functions from the `popen2` module¶