推荐学习书目
› Learn Python the Hard Way
Python Sites
› PyPI - Python Package Index
› http://diveintopython.org/toc/index.html
› Pocoo
值得关注的项目
› PyPy
› Celery
› Jinja2
› Read the Docs
› gevent
› pyenv
› virtualenv
› Stackless Python
› Beautiful Soup
› 结巴中文分词
› Green Unicorn
› Sentry
› Shovel
› Pyflakes
› pytest
Python 编程
› pep8 Checker
Styles
› PEP 8
› Google Python Style Guide
› Code Style from The Hitchhiker's Guide
这是一个创建于 3416 天前的主题，其中的信息可能已经有所发展或是发生改变。
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
 |
1
MartinWu 2015-07-19 01:42:42 +08:00
依我愚见，(self.role.permissions & permissions) == permissions 等同于 permissions is not None and self.role.permissions==permissions
|
 |
2
realityone 2015-07-19 09:57:47 +08:00
self.role.permissions = 0xFFFFFFFF
permissions = 0x0000FFFF self.role.permissions != permissions (self.role.permissions & permissions) = permissions |
Select Language