basic.py 文件源码

def is_executable(path):
    '''is the given path executable?

    Limitations:
    * Does not account for FSACLs.
    * Most times we really want to know "Can the current user execute this
      file"  This function does not tell us that, only if an execute bit is set.
    '''
    # These are all bitfields so first bitwise-or all the permissions we're
    # looking for, then bitwise-and with the file's mode to determine if any
    # execute bits are set.
    return ((stat.S_IXUSR | stat.S_IXGRP | stat.S_IXOTH) & os.stat(path)[stat.ST_MODE])