scatest.py 文件源码

def which(command):
    """
    Searches the path for the executable specified in 'command'.
    """
    for path in os.environ['PATH'].split(os.pathsep):
        execpath = os.path.join(path, command)
        if os.path.isfile(execpath) and os.access(execpath, os.X_OK):
            return execpath
    return None