Three traversal (serial number and value) methods of Python list (List)

Three ways to traverse the serial numbers and values ​​in the list:

I recently learned the language python and felt that it has greatly improved my work efficiency, so I wrote this on Valentine's Day. In this blog, without further ado, I will post the code directly

#!/usr/bin/env python
# -*- coding: utf-8 -*-
if __name__ == '__main__':
    list = ['html', 'js', 'css', 'python']

    # 方法1
    print '遍历列表方法1：'
    for i in list:
        print ("序号：%s   值：%s" % (list.index(i) + 1, i))

    print '\n遍历列表方法2：'
    # 方法2
    for i in range(len(list)):
        print ("序号：%s   值：%s" % (i + 1, list[i]))

    # 方法3
    print '\n遍历列表方法3：'
    for i, val in enumerate(list):
        print ("序号：%s   值：%s" % (i + 1, val))

    # 方法3
    print '\n遍历列表方法3 （设置遍历开始初始位置，只改变了起始序号）：'
    for i, val in enumerate(list, 2):
        print ("序号：%s   值：%s" % (i + 1, val))

The result after running the code is as shown below:

Here I will introduce enumerate () method, check it by checking the help() function. The query results are as follows:

Finally, a reminder, the second parameter of the enumerate() function only changes the serial number. The starting value does not change other things

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