How to find the length of a list in Python?

Question

Jayant Kumar · Accepted Answer

Table of Contents
Introduction
Determining the length of a list in Python is a common operation, useful for tasks such as iteration, indexing, and validation. Python provides a built-in function called len() that allows you to efficiently find the length of a list. This guide explains how to use the len() function to find the length of a list and provides practical examples.
Method to Find the Length of a List
1. Using the **len()** Function

**len()** Function: The len() function is a built-in Python function that returns the number of items in a list. It is the most straightforward and efficient way to get the length of a list.

Example:
# Sample list
numbers = [1, 2, 3, 4, 5]

# Find the length of the list
length = len(numbers)
print(length)  # Output: 5

Practical Examples
Example : Finding the Length of a List with Integers
# Sample list with integers
integer_list = [10, 20, 30, 40, 50]

# Get the length of the list
integer_list_length = len(integer_list)
print(f"The length of the integer list is {integer_list_length}.")  # Output: The length of the integer list is 5.

Example : Finding the Length of a List with Mixed Data Types
# Sample list with mixed data types
mixed_list = [1, "text", 3.14, True]

# Get the length of the list
mixed_list_length = len(mixed_list)
print(f"The length of the mixed list is {mixed_list_length}.")  # Output: The length of the mixed list is 4.

Example: Finding the Length of an Empty List
# Sample empty list
empty_list = []

# Get the length of the empty list
empty_list_length = len(empty_list)
print(f"The length of the empty list is {empty_list_length}.")  # Output: The length of the empty list is 0.

Example : Finding the Length of a List with Nested Lists
# Sample list with nested lists
nested_list = [[1, 2], [3, 4], [5, 6]]

# Get the length of the nested list
nested_list_length = len(nested_list)
print(f"The length of the nested list is {nested_list_length}.")  # Output: The length of the nested list is 3.

Conclusion
Finding the length of a list in Python is efficiently achieved using the len() function. This function is versatile and works with lists containing various data types, including integers, strings, and nested lists. Understanding how to use len() will help you effectively manage and manipulate lists in Python.

How to find the length of a list in Python?

Table of Contents

Introduction

Method to Find the Length of a List

1. Using the `len()` Function

Example:

Practical Examples

Example : Finding the Length of a List with Integers

Example : Finding the Length of a List with Mixed Data Types

Example: Finding the Length of an Empty List

Example : Finding the Length of a List with Nested Lists

Conclusion

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