utils.py 文件源码

def which(program):
    """
    Check if a program/executable exists

    :param program:
    :return:
    """

    def is_exe(f_path):
        return os.path.isfile(f_path) and os.access(f_path, os.X_OK)

    fpath, fname = os.path.split(program)

    if fpath:
        if is_exe(program):
            return program
    else:
        for path in os.environ["PATH"].split(os.pathsep):
            path = path.strip('"')
            exe_file = os.path.join(path, program)
            if is_exe(exe_file):
                return exe_file

    return None