freeCodeCamp/guide/english/python/len-function/index.md

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Python Len Function

len() is a built-in function in Python 3. This method returns the length (the number of items) of an object. It takes one argument x.

Arguments

It takes one argument, x. This argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).

Return Value

This function returns the number of elements in the argument which is passed to the len() function.

Code Sample

list1 = [123, 'xyz', 'zara'] # list
print(len(list1)) # prints 3 as there are 3 elements in the list1

str1 = 'basketball' # string
print(len(str1)) # prints 10 as the str1 is made of 10 characters

tuple1 = (2, 3, 4, 5) # tuple 
print(len(tuple1)) # prints 4 as there are 4 elements in the tuple1

dict1 = {'name': 'John', 'age': 4, 'score': 45} # dictionary
print(len(dict1)) # prints 3 as there are 3 key and value pairs in the dict1

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