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Python: len() function

len() function

The len() function is used to get the length of an object.

Version:

(Python 3.2.5)

Syntax:

len(s)

Parameter:

Name Description Required /
Optional
s A sequence (string, bytes, tuple, list, or range) or a collection (dictionary, set or frozen set). Required

Return value:

The number of items of an object.

Example: Python len() function 

ExampleList = []
print(ExampleList, 'length is', len(ExampleList))

Output:

[] length is 0

Pictorial Presentation:

Python: Built-in-function - len() function

Example: Python len() function with List

ExampleList = [2, 4, 6]
print(ExampleList, 'length is', len(ExampleList))

Output:

[2, 4, 6] length is 3

Pictorial Presentation:

Python: Built-in-function - len() function

Example: Python len() with Tuple


ExampleTuple = (2, 4, 6)
print(ExampleTuple, 'length is', len(ExampleTuple))

Output:

(2, 4, 6) length is 3

Example: Python len() with Range


ExampleRange = range(3, 12)
print('Length of', ExampleRange, 'is', len(ExampleRange))

Output:

Length of range(3, 12) is 9

Python Code Editor:

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Python: Tips of the Day

How do I check if a list is empty?

For example, if passed the following:

a = []
if not a:
  print("List is empty")

Ref: https://bit.ly/2A4JXx9