(executable, path=None)
return None
Tries to find 'executable' in the directories listed in 'path'.

    A string listing directories separated by 'os.pathsep'; defaults to
    os.environ['PATH'].  Returns the complete filename or None if not found.
Tries to find 'executable' in the directories listed in 'path'.
Tries to find executable in the directories listed in path .
def find_executable(executable, path=None):
    """Tries to find 'executable' in the directories listed in 'path'.

    A string listing directories separated by 'os.pathsep'; defaults to
    os.environ['PATH'].  Returns the complete filename or None if not found.
    """
    _, ext = os.path.splitext(executable)
    if (sys.platform == 'win32') and (ext != '.exe'):
        executable = executable + '.exe'

    if os.path.isfile(executable):
        return executable

    if path is None:
        path = os.environ.get('PATH', None)
        if path is None:
            try:
                path = os.confstr("CS_PATH")
            except (AttributeError, ValueError):
                # os.confstr() or CS_PATH is not available
                path = os.defpath
        # bpo-35755: Don't use os.defpath if the PATH environment variable is
        # set to an empty string

    # PATH='' doesn't match, whereas PATH=':' looks in the current directory
    if not path:
        return None

    paths = path.split(os.pathsep)
    for p in paths:
        f = os.path.join(p, executable)
        if os.path.isfile(f):
            # the file exists, we have a shot at spawn working
            return f
    return None
def find_executable ( executable , path = None ) : _ , ext = os . path . splitext ( executable ) if ( sys . platform == 'win32' ) and ( ext != '.exe' ) : executable = executable + '.exe' if os . path . isfile ( executable ) : return executable if path is None : path = os . environ . get ( 'PATH' , None ) if path is None : try : path = os . confstr ( "CS_PATH" ) except ( AttributeError , ValueError ) : # os.confstr() or CS_PATH is not available path = os . defpath # bpo-35755: Don't use os.defpath if the PATH environment variable is # set to an empty string # PATH='' doesn't match, whereas PATH=':' looks in the current directory if not path : return None paths = path . split ( os . pathsep ) for p in paths : f = os . path . join ( p , executable ) if os . path . isfile ( f ) : # the file exists, we have a shot at spawn working return f return None