Specific usage of enumeration function enumerate() in Python

Compared with range,list And so on ,enumerate It's not easy to use just by shape . in fact ,enumerate It still works .

enumerate() yes python Built in functions for 、 Apply to python2.x and python3.x

enumerate In the dictionary is enumeration 、 List means

enumerate The parameter is ergodic / Objects that can be iterated ( As listing 、 character string )

enumerate It's mostly used in for Count in the loop , Use it to get both index and value , That is to say index and value Value can be used enumerate

enumerate() Back to a enumerate object

python The most common data structure in is list, Handle list Each element in , Usually for Cycle through .

We see first , Joined the enumerate after ,list The change of ：

One more index , At the same time, it can read the elements . What's the use of this feature ？ Look at a piece of code ：

Look at the way 3 You can access the index more easily i And the corresponding elements s.

and , use enumerate It will make the code more advanced ~

for example ： It is known that lst = [1,2,3,4,5,6], Request output :

0,1
1,2
2,3
3,4
4,5
5,6

If you want to count the number of lines in the file , It can be written like this ：

This method is simple , But it can be slow , It doesn't even work when the file is large .

You can use enumerate()：

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