python---基础知识回顾（其他）

Posted 2020-11-02 山上有风景

一：语句中的入栈顺序

同其他语言（C,C++等）一样入栈顺序是右端先进行执行后入栈（python3.5中），在python2.7之前的入栈顺序是左端先

Python2.7:

Python 2.7.10 (default, May 23 2015, 09:44:00) [MSC v.1500 64 bit (AMD64)] on wi
n32
Type "help", "copyright", "credits" or "license" for more information.

>>> ls = [1,2,3]
>>> print ls,ls.reverse()　　#print先入栈执行，然后reverse再入栈执行
[1, 2, 3] None　　
>>> print ls
[3, 2, 1]

Python3.5:

Python 3.5.4 (v3.5.4:3f56838, Aug  8 2017, 02:17:05) [MSC v.1900 64 bit (AMD64)]
 on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> li = [4,3]
>>> print(li,li.reverse())　　#右端先入栈执行reverse，再输出li，li.reverse()的结果None
[3, 4] None
>>> print(li)
[3, 4]