python 权限判断问题

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This topic created in 3996 days ago, the information mentioned may be changed or developed.

def can(self, permissions):
return self.role is not None and \
(self.role.permissions & permissions) == permissions

我想问下直接用self.role.permissions==permissions 不可以吗为什么要用
        (self.role.permissions & permissions) == permissions 优点在哪里

2 replies

MartinWu

Jul 19, 2015

依我愚见，(self.role.permissions & permissions) == permissions 等同于 permissions is not None and self.role.permissions==permissions

realityone

Jul 19, 2015

self.role.permissions = 0xFFFFFFFF
permissions = 0x0000FFFF

self.role.permissions != permissions
(self.role.permissions & permissions) = permissions