mirror of https://github.com/python/cpython
49 lines
1.5 KiB
Python
49 lines
1.5 KiB
Python
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"""distutils.spawn
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Provides the 'spawn()' function, a front-end to various platform-
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specific functions for launching another program in a sub-process.
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Also provides the 'find_executable()' to search the path for a given
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executable name.
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"""
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import sys
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import os
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import os.path
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def find_executable(executable, path=None):
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"""Tries to find 'executable' in the directories listed in 'path'.
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A string listing directories separated by 'os.pathsep'; defaults to
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os.environ['PATH']. Returns the complete filename or None if not found.
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"""
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_, ext = os.path.splitext(executable)
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if (sys.platform == 'win32') and (ext != '.exe'):
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executable = executable + '.exe'
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if os.path.isfile(executable):
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return executable
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if path is None:
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path = os.environ.get('PATH', None)
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if path is None:
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try:
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path = os.confstr("CS_PATH")
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except (AttributeError, ValueError):
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# os.confstr() or CS_PATH is not available
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path = os.defpath
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# bpo-35755: Don't use os.defpath if the PATH environment variable is
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# set to an empty string
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# PATH='' doesn't match, whereas PATH=':' looks in the current directory
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if not path:
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return None
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paths = path.split(os.pathsep)
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for p in paths:
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f = os.path.join(p, executable)
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if os.path.isfile(f):
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# the file exists, we have a shot at spawn working
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return f
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return None
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