Python List (List) Three traversal (sequence number and value) methods, pythonlist

Python List (List) Three traversal (sequence number and value) methods, pythonlist

Three methods are used to traverse the serial numbers and values in the list:

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1 #! /Usr/bin/env python 2 #-*-coding: UTF-8-*-3 if _ name _ = '_ main __': 4 list = ['html', 'js', 'css ', 'python'] 5 6 # method 1 7 print 'traverse list Method 1: '8 for I in list: 9 print ("No.: % s value: % s" % (list. index (I) + 1, I) 10 11 print '\ n traversal list Method 2: '12 # method 213 for I in range (len (list )): 14 print ("No.: % s value: % s" % (I + 1, list [I]) 15 16 # method 317 print '\ n traversal list method 3: '18 for I, val in enumerate (list): 19 print ("No.: % s value: % s" % (I + 1, val )) 20 21 # method 322 print '\ n traverse list method 3 (set the start position of traversal and only change the start sequence number): '23 for I, val in enumerate (list, 2): 24 print ("No.: % s value: % s" % (I + 1, val ))

The result after running the code is shown in:

 

Here we will introduce the enumerate () method and view it through the help () function. The query results are as follows:

The second parameter of the enumerate () function only changes the starting value of the sequence number and does not change other parameters.