forked from CamDavidsonPilon/matplotlib
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathsubprocess.py
More file actions
81 lines (64 loc) · 2.76 KB
/
subprocess.py
File metadata and controls
81 lines (64 loc) · 2.76 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
"""
A replacement wrapper around the subprocess module, with a number of
work-arounds:
- Provides the check_output function (which subprocess only provides from Python
2.7 onwards).
- Provides a stub implementation of subprocess members on Google App Engine
(which are missing in subprocess).
Instead of importing subprocess, other modules should use this as follows:
from matplotlib.compat import subprocess
This module is safe to import from anywhere within matplotlib.
"""
from __future__ import absolute_import # Required to import subprocess
from __future__ import print_function
import subprocess
__all__ = ['Popen', 'PIPE', 'STDOUT', 'check_output', 'CalledProcessError']
if hasattr(subprocess, 'Popen'):
Popen = subprocess.Popen
# Assume that it also has the other constants.
PIPE = subprocess.PIPE
STDOUT = subprocess.STDOUT
CalledProcessError = subprocess.CalledProcessError
else:
# In restricted environments (such as Google App Engine), these are
# non-existent. Replace them with dummy versions that always raise OSError.
def Popen(*args, **kwargs):
raise OSError("subprocess.Popen is not supported")
PIPE = -1
STDOUT = -2
# There is no need to catch CalledProcessError. These stubs cannot raise
# it. None in an except clause will simply not match any exceptions.
CalledProcessError = None
def _check_output(*popenargs, **kwargs):
r"""Run command with arguments and return its output as a byte
string.
If the exit code was non-zero it raises a CalledProcessError. The
CalledProcessError object will have the return code in the
returncode
attribute and output in the output attribute.
The arguments are the same as for the Popen constructor. Example::
>>> check_output(["ls", "-l", "/dev/null"])
'crw-rw-rw- 1 root root 1, 3 Oct 18 2007 /dev/null\n'
The stdout argument is not allowed as it is used internally.
To capture standard error in the result, use stderr=STDOUT.::
>>> check_output(["/bin/sh", "-c",
... "ls -l non_existent_file ; exit 0"],
... stderr=STDOUT)
'ls: non_existent_file: No such file or directory\n'
"""
if 'stdout' in kwargs:
raise ValueError('stdout argument not allowed, it will be overridden.')
process = Popen(stdout=PIPE, *popenargs, **kwargs)
output, unused_err = process.communicate()
retcode = process.poll()
if retcode:
cmd = kwargs.get("args")
if cmd is None:
cmd = popenargs[0]
raise subprocess.CalledProcessError(retcode, cmd, output=output)
return output
# python2.7's subprocess provides a check_output method
if hasattr(subprocess, 'check_output'):
check_output = subprocess.check_output
else:
check_output = _check_output