(37) subprocessで外部のプログラムを実行

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この記事は最終更新から 1820日 が経過しています。

subprocess.call を使用して外部プログラムを実行してみる。

call は、外部プログラムの終了を待って復帰する。
call は、外部プログラムの戻り値を返す。

>>> import subprocess as sp
>>>
>>> arg = ['gcc','--version']
>>>
>>> ret = sp.call(arg)
gcc (GCC) 4.9.0
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

>>>
>>> ret
0

subprocess.Popen でも同じことができる。

>>> import subprocess as sp
>>>
>>> arg = ['gcc','--version']
>>>
>>> proc = sp.Popen(arg, stdout=sp.PIPE)
>>> proc.returncode
0
>>> stdoutData, stderrData = proc.communicate()
>>>
>>> stdoutData
'gcc (GCC) 4.9.0\nCopyright (C) 2014 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\n'
>>>
>>> out = stdoutData.split('\n')
>>> out[0]
'gcc (GCC) 4.9.0'
>>>
>>> out[1]
'Copyright (C) 2014 Free Software Foundation, Inc.'
>>>
>>> out[2]
'This is free software; see the source for copying conditions.  There is NO'
>>>
>>> out[3]
'warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.'