看 PyCon 2015 视频学习到的内容

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

This topic created in 4218 days ago, the information mentioned may be changed or developed.

下面的表达式的结果是：

False is False is False

下面哪个更快? +=还是extend()?：

ba = bytearray()

ba += ....
ba.extend(...)

使用super()和多继承可以改变父类的搜索顺序。

Supplement 1 · Apr 25, 2015

视频：

https://www.youtube.com/channel/UCgxzjK6GuOHVKR_08TT4hJQ

false

PyCon

bytearray

12 replies • 2015-04-25 20:41:45 +08:00

pyKun

Apr 25, 2015

False is False is False 这个竟然是 True =,=

Apr 25, 2015

False is False is False -> True 求科普

dofine

Apr 25, 2015

@pyKun
@c
Chaining operators like a is b is c is equivalent to a is b and b is c. So the first example is False is False and False is False, which evaluates to True and True which evaluates to True Having parenthesis leads to the result of one evaluation being compared with the next variable (as you say you expect), so (a is b) is c compares the result of a is b with c.

(http://stackoverflow.com/questions/28104393/why-does-false-is-false-is-false-evaluate-to-true)