我认为您的COMSPEC环境变量可能有问题：
>>> import os
>>> os.environ['COMSPEC']
'C:\\Windows\\system32\\cmd.exe'
>>> import subprocess
>>> subprocess.call('dir', shell=True)
(normal output here)
>>> os.environ['COMSPEC'] = 'C:\\nonexistent.exe'
>>> subprocess.call('dir', shell=True)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "c:\Python27\lib\subprocess.py", line 493, in call
return Popen(*popenargs, **kwargs).wait()
File "c:\Python27\lib\subprocess.py", line 679, in __init__
errread, errwrite)
File "c:\Python27\lib\subprocess.py", line 896, in _execute_child
startupinfo)
WindowsError: [Error 2] The system cannot find the file specified
正如追溯所指出的那样，我通过深入subprocess.py并研究_execute_child函数来发现了这个潜在问题。在这里，您将找到一个以if shell:该块开头的块，它将在环境中搜索所述变量，并使用它来创建用于启动该过程的参数。
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