Python判断某个用户对某个文件的权限

在Python我们要判断一个文件对当前用户有没有读、写、执行权限，我们通常可以使用os.access函数来实现，比如：

    # 判断读权限
    os.access(<my file>, os.R_OK)
    # 判断写权限
    os.access(<my file>, os.W_OK)
    # 判断执行权限
    os.access(<my file>, os.X_OK)

    # 判断读、写、执行权限
    os.access(<my file>, os.R_OK | os.W_OK | os.X_OK)

但是如果要判断任意一个指定的用户对某个文件是否有读、写、执行权限，Python中是没有默认实现的，此时我们可以通过下面的代码断来判断

    import os
    import pwd
    import stat

    def is_readable(cls, path, user):
      user_info = pwd.getpwnam(user)
      uid = user_info.pw_uid
      gid = user_info.pw_gid
      s = os.stat(path)
      mode = s[stat.ST_MODE]
      return (
        ((s[stat.ST_UID] == uid) and (mode & stat.S_IRUSR > 0)) or
        ((s[stat.ST_GID] == gid) and (mode & stat.S_IRGRP > 0)) or
        (mode & stat.S_IROTH > 0)

        )
    def is_writable(cls, path, user):
      user_info = pwd.getpwnam(user)
      uid = user_info.pw_uid
      gid = user_info.pw_gid
      s = os.stat(path)
      mode = s[stat.ST_MODE]
      return (
        ((s[stat.ST_UID] == uid) and (mode & stat.S_IWUSR > 0)) or
        ((s[stat.ST_GID] == gid) and (mode & stat.S_IWGRP > 0)) or
        (mode & stat.S_IWOTH > 0)

        )


    def is_executable(cls, path, user):
      user_info = pwd.getpwnam(user)
      uid = user_info.pw_uid
      gid = user_info.pw_gid
      s = os.stat(path)
      mode = s[stat.ST_MODE]
      return (
        ((s[stat.ST_UID] == uid) and (mode & stat.S_IXUSR > 0)) or
        ((s[stat.ST_GID] == gid) and (mode & stat.S_IXGRP > 0)) or
        (mode & stat.S_IXOTH > 0)

        )

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。