When processing various types of sequences in python, if we want to display the elements of this sequence and their subscripts , we can use enumerate()function.

enumerate() function is used to traverse the elements in the sequence and their subscripts. The usage is as follows:

1. The parameter is a tuple:

for index, value in enumerate(('a', 'b', 'c')):
    '''下标，元素'''
    print(index,value)

2..The parameter is a listlist:

for index, value in enumerate([1, 2, 3]):
    '''下标，元素'''
    print(index, value)

3.The parameter is a stringstring:

for index, value in enumerate('abc'):
    '''下标，元素'''
    print(index, value)

4. The parameter is a dictionary dict:

for index, value in enumerate({'a': 1, 'b': 2}):
    '''下标（字典无序性），元素（Key值）'''
    print(index, value)

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