How to find Length of Python List?

Python List Length

To find the length of a Python List, you can use Python built-in function len().

len() accepts Python List as an argument and returns an integer representing number of elements in the list.

Example 1 – Find Length of List

In the following python program, we initialize a python list with integers and find the length of the list (number of elements in the list).

example.py – Python Program

#initialize list
aList = [21, 28, 14, 96, 84, 65, 74, 31]

#find list length
len = len(aList)

#print list length
print('Length of the list is :', len)

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Output

Length of the list is : 8

Example 2 – Find Length of List with elements of Different Datatypes

In the following example, we initialize a list with different datatypes and try to find the length of the list using len().

example.py – Python Program

#initialize list
aList = [True, 28, 'Tiger']

#find list length
len = len(aList)

#print list length
print('Length of the list is :', len)

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Output

Length of the list is : 3

Example 3 – Find Length of an Empty List

Of course, the length of an empty list is zero. But we are finding that out programmatically in the following example.

example.py – Python Program

#empty list
aList = []

#find list length
len = len(aList)

#print list length
print('Length of the list is :', len)

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Output

Length of the list is : 0

Conclusion

In this Python Tutorial, we learned how to find the length of a list using len() function with the help of example Python programs.