Python allows you to add comments to a script, which you can use to explain what your script is doing.

In Python, any line that starts with the pound (#) character is considered a comment. For example, the following script has a comment as its first line:

# This script displays a greeting
greeting = "Hello, world!"
print greeting

Comments are always ignored by Python, so you can write whatever you want in them.

Comments can be on multiple lines, provided you include a # character before each line:

#
# This is a simple script that displays
# a greeting message.
#
greeting = "Hello, world!"
print greeting

You can also append a comment to any line of code. Whenever Python sees the # character, it assumes that the rest of the line is a comment and can be ignored. For example:

greeting = "Hello, world!"
print greeting   # actually print the greeting

	It is always a good idea to include comments in your script, unless it is very simple. If you ever need to change the script, the comments will provide a reminder of what the script does.