Home > Backend Development > Python Tutorial > Comparison of range() function and list in Python

Comparison of range() function and list in Python

不言
Release: 2018-04-19 11:18:43
Original
2840 people have browsed it

The following is a comparison of the range() function and list in Python. It has a good reference value and I hope it will be helpful to everyone. Let’s take a look together

Everyone who uses Python knows that the range() function and list are very convenient. When I used it again today, I discovered a lot of details that I had seen before but had forgotten. Record range() and list here.

>>> range(1,5) #代表从1到5(不包含5) 
[1, 2, 3, 4] 
>>> range(1,5,2) #代表从1到5,间隔2(不包含5) 
[1, 3] 
>>> range(5)  #代表从0到5(不包含5) 
[0, 1, 2, 3, 4]
Copy after login

Look at the list operation again:

array = [1, 2, 5, 3, 6, 8, 4] 
#其实这里的顺序标识是 
[1, 2, 5, 3, 6, 8, 4] 
(0,1,2,3,4,5,6) 
(-7,-6,-5,-4,-3,-2,-1) 
 
>>> array[0:] #列出0以后的 
[1, 2, 5, 3, 6, 8, 4] 
>>> array[1:] #列出1以后的 
[2, 5, 3, 6, 8, 4] 
>>> array[:-1] #列出-1之前的 
[1, 2, 5, 3, 6, 8] 
>>> array[3:-3] #列出3到-3之间的 
[3]
Copy after login

#那么两个[::]会是什么那?
>>> array[::2] 
[1, 5, 6, 4] 
>>> array[2::] 
[5, 3, 6, 8, 4] 
>>> array[::3] 
[1, 3, 4] 
>>> array[::4] 
[1, 6]
Copy after login

#如果想让他们颠倒形成reverse函数的效果 
>>> array[::-1] 
[4, 8, 6, 3, 5, 2, 1] 
>>> array[::-2] 
[4, 6, 5, 1]
Copy after login

Related recommendations:

For in python Loops and range built-in functions

Pitfalls to pay attention to when deleting elements from python list

The above is the detailed content of Comparison of range() function and list in Python. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template