Page 294 - AI Ver 1.0 Class 9
P. 294
Task
Solve the following expressions using the operator precedence:
• 10 + 20 / 5 – 3 * 2
• 5 * (10 + 5) + 10 – 5
Comments in Python
Comments are used to increase the readability of the code. We use them to give proper understanding of the
code in simple English statements. They are completely ignored by the Python interpreter. It is always a good
practice to add comments in your code so that if anybody in future wish to understand or modify your code,
then through comments it will be easy to interpret the instructions. There are two different ways of writing
comments in Python. Let us learn about them in detail.
Single Line Comment
Single line comment starts with hash symbol # followed by the text to be written as a comment that lasts till the
end of the line.
For example,
# assigning a value to a variable
num1 = 10
num2 = 20
# calculating the average
(num1 + num2) / 2
Multiple Line Comments
When we add up comments which occupy two or more lines then we begin the comment with either 3 times
single quotes ''' or double quotes """, followed by text on multiple lines and end with single quotes ''' or double
quotes """ to mark the end of the comment. For example,
"""This program calculates
the average of
two numbers stored in
two different variables"""
a = 10
b = 20
c = (a + b) / 2
292 Touchpad Artificial Intelligence-IX

