Python - Comments

2 minute read

In Python, comments are used to explain the purpose of the code to other developers or to remind yourself of the purpose of the code. Comments are not executed by the Python interpreter and therefore have no effect on the output of the program. They are simply ignored by the interpreter.

There are two ways to add comments in Python!

  1. Single-line comments: Single-line comments begin with the hash character (#) and continue until the end of the line. They are typically used to explain a single line of code or to temporarily disable a line of code.

  2. Multi-line comments: Multi-line comments are also known as block comments. They are enclosed in triple quotes (“"”…”””) or single quotes (‘'’…’’’) and can span multiple lines. Multi-line comments are typically used to explain a larger block of code or to provide documentation for a function or module.

Single-Line Comments

Single-line comments are used to explain a single line of code. Here is an example:

# This is a single-line comment
print("Hello, World!")

In this example, the comment explains that the next line of code will print the text “Hello, World!” to the console.

You can also use single-line comments to temporarily disable a line of code. For example:

# print("Hello, World!")

In this example, the print statement is commented out and will not be executed when the program is run.

Multi-Line Comments

Multi-line comments are enclosed in triple quotes (“"”…”””) or single quotes (‘'’…’’’) and can span multiple lines. Here is an example:

"""
This is a multi-line comment
that spans multiple lines.
It is typically used to explain
a larger block of code.
"""
print("Hello, World!")

In this example, the multi-line comment explains that the next line of code will print the text “Hello, World!” to the console.

You can also use multi-line comments to provide documentation for a function or module. For example:

"""
This module contains functions
for performing various math operations.
"""

def add(x, y):
    """
    This function adds two numbers together.
    """
    return x + y

In this example, the multi-line comment explains the purpose of the module and provides documentation for the add function.

Conclusion

Comments are an essential part of any programming language, and Python is no exception. Whether you’re explaining a single line of code or documenting a function or module, comments help make your code more readable and understandable to other developers. By using single-line and multi-line comments effectively, you can improve the quality of your code and make it easier to maintain over time.

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