The enumerate function explains and writes a demo

enumerate()is one of Python's built-in functions for converting an iterable object (such as a list, tuple, string) into an enumeration object, and returns the index and value of each element.

Specifically, the function will enumerate each element in startingenumerate(iterable, start=0) from index , and return an enumeration object containing tuples. Among them, represents the position of the current element in the iterable object, counting ; represents the value of the current element.startiterable(index, item)indexstartitem

Here is a simple demo example:

# Enumerate all elements and their indices in a list
fruits = ['apple', 'banana', 'cherry']
for index, fruit in enumerate(fruits):
    print(index, fruit)

# output:
# 0 apple
# 1 banana
# 2 cherry

In the above code, enumerate()the function is used to enumerate all elements and their indexes fruitsin . Since no startparameter , it starts counting from 0 by default. The result of the run shows the index and name of each fruit in the list.

Another thing to note is forthat enumerate()when using the function in a loop, you can use parentheses to split each tuple of the enumeration object into variables. For example, the following syntax can be used:

pythonCopy code

# Enumerate all elements and their indexes in a list, and split the tuples into variables
fruits = ['apple', 'banana', 'cherry']
for index, fruit in enumerate(fruits):
    print(index, fruit)
 

In this way, the indexand fruitto represent the index and value of the current element, and the code is more concise and easy to read.