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This topic created in 4036 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)