Python len() Function Reference on W3Schools

Overview

• URL Source: W3Schools Python len() Function
• The len() function in Python is used to return the number of items in an object.

Definition and Usage

• Function: len()
• Purpose: Returns the number of items in a sequence or collection.
• When used on a string, it returns the number of characters.

Syntax

len(object)

• Parameter:
  • object: Required. The object can be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).

Examples

• Example 1: Number of items in a list

  mylist = ["apple", "banana", "cherry"]
  x = len(mylist)
  

• Example 2: Number of characters in a string

  mystring = "Hello"
  x = len(mystring)
  

Additional Resources

• Users are encouraged to try the examples on their own Python server.
• For more examples and practice, users can visit the W3Schools TryPython page.

Related Topics

• Python Built-in Functions for a complete list of Python's built-in functions.

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