Which Character is Used in Python to Make a Single Line Comment?

Which Character is used in Python to make a Single Line Comment?

In technical terms, comments are lines of code or statement that the interpreter or Python compiler ignores during execution. These are used to write some programmer readable information/explanation about the code, which helps other programmers understand the code.

Python offers a pretty simple and straightforward way to write a comment. We can write a single-line comment by adding a single # character before any statement or line of code.

Transform Your Career

Choose from our industry-leading programs designed for career success

NSDC Certified

Modern Software and AI Engineering Program

Master full-stack development with AI integration

12 MonthsDuration

AI-LedCurriculum

Career SupportSupport

+1000 more

Go to Program

NSDC Certified

Modern Data Science and ML with specialisation in AI

Advanced data science techniques with AI specialization

12 MonthsDuration

AI-LedCurriculum

Career SupportSupport

+1000 more

Go to Program

NSDC Certified

Advanced AIML with Specialisation in Agentic AI

Deep dive into AIML with focus on Agentic systems

12 MonthsDuration

AI-LedCurriculum

Career SupportSupport

+1000 more

Go to Program

NSDC Certified

DevOps, Cloud & AI Platform Engineering

Build and manage AI-powered cloud infrastructure

12 MonthsDuration

AI-LedCurriculum

Career SupportSupport

+1000 more

Go to Program

NSDC Certified

AI Engineering Advanced Certification by IIT-Roorkee

Premier AI engineering certification from IIT-Roorkee

3 MonthsDuration

AI-LedCurriculum

Career SupportSupport

Go to Program

Writing Single-Line Comments

See this basic example to know how comments are written in Python.

Code:

Output:

Digression: We can add multi-line comments in python by wrapping the string of comments in triple quotes.

These multi-line comments are generally used to write long comments conveniently because it avoids writing a # character on each line.

There is a term docstring in python, which stands for documentation string. It is used to describe any module, function, or programming component. These docstrings in python are nothing but multi-line comments.

Code:

Output:

Explanation:

• The output of the program conveys that the interpreter ignores lines from 3-5.

Examples

Add two Numbers with Comments.

We have already seen how to write comments, let's discuss how comments are used to describe some information about the code.

Code:

Input:

Output:

Explanation:

• You can see how we are writing some information about the code with the help of comments.
• These comments are also getting ignored by the interpreter.

Add a Single Line Comment after Another Statement

It is important to note that only the characters written after # are considered as comment.

Code:

Output:

Explanation:

• As you can see in the following example, the entire line is not considered a comment, hence interpreted by python.

Why Comments?

We have already discussed the comments and their examples, let's see why there is a need of such concept of comments in programming.

1. Since programming can be pretty complex, if two or more programmers work on the same program, one might have difficulty understanding the code written by the other. Hence, comments help in understanding the program by describing the information of some lines of code in English or human-readable language.
2. Programmers often comment on code instead of deleting it to prevent that code from being executed. This technique makes debugging easier, and also those commented lines can remain in the program code without affecting its overall working.