Comments in Python: Why are They Important And How to Use Them

What Are Comments in Python Used For?

Comments in Python are identified with a hash symbol, #, and extend to the end of the line. Hash characters in a string are not considered comments, however. There are three ways to write a comment - as a separate line, beside the corresponding statement of code, or as a multi-line comment block.

There are multiple uses of writing comments in Python. Some significant uses include:

• Increasing readability
• Explaining the code to others
• Understanding the code easily after a long-term
• Including resources
• Re-using the existing code

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Advantages of Comments in Python

1. Enhanced Readability

Comments help you and others understand the purpose and functionality of your code by clearly stating the reasoning behind it. This is particularly useful for complicated code or stuff you return to after a long break.

2. Code That Documents Itself

Well-written comments make your code almost self-documenting. Comments that provide the logic behind your coding choices become important resources for future readers who may need to comprehend or alter the code.

3. Improved Cooperation

In team projects, effective communication is essential for efficient teamwork. They enable other developers to incorporate their contributions easily and rapidly understand the operation of the code.

4. Improved troubleshooting

By describing the anticipated behavior of different code blocks, comments can serve as useful cues for troubleshooting. This can help to speed up the process of identifying and resolving program faults.

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5. Code Control

Comments let you turn off certain code segments for targeted debugging. This enables you to debug individual software components without interfering with the remainder of the code's execution.

6. Logic Explanation

If there are complex algorithms or logic buried in the code, comments can explain them. Understanding the reasoning behind intricate computations or decision-making processes can be greatly aided by this.

7. Code Maintainability

Comments facilitate code maintenance and modification, particularly after prolonged usage. Developers can more confidently and effectively make the necessary modifications to the code by understanding the code's purpose through comments.

8. Code Reuse

Reusability in other program sections is encouraged by well-written comments that describe a code section's usefulness. This can leverage well-commented existing code, saving time and effort.

9. Knowledge Sharing

You can impart your coding expertise to colleagues or aspiring developers by using comments as a forum. You can aid in the development of a shared understanding of the codebase by explaining your reasoning and coding decisions.

10. Learning Aid

Even for yourself, comments can be a very beneficial learning aid. You can learn more about your coding style and process from when you wrote your code by going back and adding comments.

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What Are the Different Types of Comments in Python?

There are three types of comments: single-line, multi-line, and docstring comments. The syntax of comments varies depending on the type. This tutorial will explore every kind of comment individually, along with examples.

1. Single-Line Comments

Single-line comments begin with the “#” character. Anything that is written in a single line after ‘#’ is considered as a comment. The syntax for writing single-line comments is:

# comments here

There are two ways of using single-line comments in Python. You can use it before the code or next to the code. The example depicted below shows the use of comments in both ways.

PEP8, Python Style Guide, recommends using less than 79 characters in a single-line comment to make it easier to read. If your comment is exceeding the recommended length, you can use the next type: multi-line comments.

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2. Multi-Line Comments

Python does not support multi-line comments. However, there are multiple ways to overcome this issue. None of these ways are technically multi-line comments, but you can use them as one. The first way is by using # at the beginning of each line of the comment.

The next way is by using string literals but not assigning them to any variables. If you do not assign a string literal to a variable, the Python interpreter ignores it. Use this to your advantage to write multi-line comments. You can either use a single (‘’) quotation or double (“”) quotation.

You can also use multi-line strings for commenting. To do this, use either a ‘’ or “” quotation marks three times.

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3. Python Docstrings

Python provides an in-built feature called docstrings for commenting on modules, methods, functions, objects, and classes. They are written in the first line after defining a module, function, method, etc., using three quotation marks (‘’ or “”). If you do not use it in the first line, the interpreter will not take it as a docstring. You can also access docstrings using the __doc__ attribute.

4. String Literals

# This is a single-line comment

"""
This is a multi-line comment.
It spans multiple lines.
"""

def example_function():
    """This is a docstring, a type of string literal used for documentation."""
    pass

'''
Another example of a multi-line comment
using single quotes.
'''

• The ‘#’ symbol is used for a single-line comment.
• Triple quotes ‘"""’ or ‘'''’ are used for multi-line comments.
• The string literal ‘"""This is a docstring..."""’ inside the function ‘example_function()’ serves as a documentation string (docstring), which is a special type of string literal used for providing information about the function.

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How to Write Good Comments in Python?

Comments are a crucial part of a program. Hence, it is essential to learn how to write good comments. Here are some characteristics that define good comments.

• Ensure that they are concise
• Don’t write generic comments; only have them if they add information

(a=10 #assigning 10 to a, avoid writing such generic comments)

• Write comments that describe the overall task of a function or method and not specific details
• Good comments are self-explanatory
• Don’t write redundant comments

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Conclusion

In Python, comments are essential for improving your code's readability, maintainability, and general quality. They are an indispensable resource for recording your ideas, deciphering intricate reasoning, and giving context to other developers—or your future self. When comments are used appropriately, they help with debugging, improve teamwork, and enhance teaching and learning. You may make sure that your code is functional but also comprehensible and accessible by becoming an expert commenter.

Enrolling in an extensive Python training program will help you advance your language knowledge and gain greater insight into coding best practices. This certification can help you become a more skilled Python developer by helping you grasp Python deeper and enhance your coding skills.

FAQs

1. How do you comment on multiple lines in Python?

In Python, you can build a multi-line remark block by using triple quotes ''''' or '"""' to comment on many lines. Although these are multi-line strings, not comments, they can temporarily comment out code parts. A more popular method is to begin each line with the normal single-line comment marker, '#'. This technique helps add notes or turn off several lines of code during debugging.

2. What are the comments in Python input?

Annotations in Python code that are disregarded by the Python interpreter are called comments. They serve to clarify the code, improving its readability and maintainability. For single-line comments, the '#' symbol is used to start comments. Anything on the same line that comes after this symbol is regarded as a comment and is not performed. Triple quotes (''''' or '"""') can be used to create multi-line comments, but they are actually multi-line strings that are not executed since they are not set to a variable.

3. How do you comment on a single line in Python?

Python lets you remark on a single line using the '#' symbol. The interpreter interprets everything on the same line that comes after this symbol as a comment and ignores it. Single-line comments can add quick notes or explanations regarding the code. They can be included at the start or end of a line of code to provide context for that specific line.