Understanding Comments in Python

In Python, comments serve an important purpose of making your code more understandable both to yourself and to others. A key part of Python syntax is understanding how to comment correctly. Based on the question posed, the correct way to comment a single line in Python is # This is a comment. This symbol # denotes a comment in Python. The rest of the line following the # will be treated as a comment and will not be executed.

To add comments in Python, it really couldn’t be easier, just simply insert # at the start of a line, like so:

# This is a Python comment

In this piece of code, nothing will actually be executed. All that will happen is that the Python interpreter will ignore the line.

Commenting lines of code is often a good practice, especially when codes begin to get more complex. You or other developers may find it hard to understand what certain parts of the code do. Leaving comments can help you remember what specific parts of the code do, even after days or weeks.

For example, consider algorithms or intricate codes. Here is an example,

# Calculation of Fibonacci series
a, b = 0, 1
while b < 10:
    print(b)
    a, b = b, a+b

Here, # Calculation of Fibonacci series is a single line comment that gives an insight into what the Python code will execute.

While Python does not offer multi-line comment syntax like /* This is a comment */ in C++ or <!-- This is a comment --> in HTML, you can create a multiline comment in Python by inserting a hashtag for each line:

# This is 
# a multiline 
# comment

Alternatively, since Python will ignore string literals that are not assigned to a variable, you could also add a multiline string (triple quotes) in your code, and place your comment inside it:

"""
This is a multiline
comment or docstring
"""

However, it's worth mentioning that this would not be considered a true Python comment, as it still impacts the Python interpreter, unlike #.

In conclusion, the Python "pound" sign # is the right way to comment a single-line in Python, which both helps in making code easy to understand and improving its readability.