Python help() Function

The help() function in Python is a built-in tool that gives you quick access to documentation about Python objects — such as functions, classes, modules, and keywords.

This is a very useful function for beginners who want to understand what a function or module does without searching online.

Syntax

help(object)

or, simply:

help()

Parameters:

• object – Optional. Can be a function, class, module, keyword, or anything Python can describe.

Returns:

• Displays the help documentation in the console. Does not return a value.

Example 1: Help on a Function

help(len)

Output (shortened):

Help on built-in function len in module builtins:

len(obj, /)
    Return the number of items in a container.

Example 2: Help on a Module

import math
help(math)

Output (first few lines):

Help on module math:

NAME
    math - This module provides access to the mathematical functions...

FUNCTIONS
    acos(...)
    acosh(...)
    ...

Example 3: Help Without Arguments

help()

This opens an interactive help utility in the terminal. You can type topics like modules, keywords, symbols, or topics.

To exit, press q or use quit.

Use Case: Why Use help()?

• To explore what a built-in function does
• To view available functions inside a module
• To quickly understand how to use a class or method

Common Mistakes

• Do not pass a string: help("len") will work but gives help on the string, not the function.
• Use object reference: Always pass the actual function or module (like len, not "len").

Interview Tip

If you’re in an environment without internet (like a coding test), help() can give you quick guidance on syntax and usage.

Summary

• help() displays documentation for Python objects.
• Great for understanding built-in functions and modules.
• Also works interactively with no arguments.

Practice Task

Try using help() on the following Python objects:

• str
• list
• abs
• dict

Example:

help(str)