Utils.py 文件源码

def check_exe(name, env=None):
    """
    Ensure that a program exists
    :type name: string
    :param name: name or path to program
    :return: path of the program or None
    """
    if not name:
        raise ValueError('Cannot execute an empty string!')
    def is_exe(fpath):
        return os.path.isfile(fpath) and os.access(fpath, os.X_OK)

    fpath, fname = os.path.split(name)
    if fpath and is_exe(name):
        return os.path.abspath(name)
    else:
        env = env or os.environ
        for path in env["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, name)
            if is_exe(exe_file):
                return os.path.abspath(exe_file)
    return None