What does index mean in python

1. Overview

Many times we need to find an element in the list and output the corresponding index value; this time we need to use the index() method .

2. Index() method

2.1 Description

The index() function is used to find the index position of the first matching item of a certain value from the list.

2.2 Usage

list.index(obj)

Comments:

obj——The object to be found.

Return value:

This method returns the index position of the search object, and throws an exception if the object is not found.

Example:

A = [123, 'xyz', 'zara', 'abc']
print(A.index('xyz')) 
# 结果 1
print(A.index('zzz'))
# 报错 ：ValueError: 'zzz' is not in list

Run result:

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