Page 422 - ComputerScience_Class_11
P. 422
Output
Python is easy to learn
This program runs in script mode
12.7 PYTHON CHARACTER SET
A programming language character set is the complete set of symbols and characters that can be used to create
programs. It generally consists of capital and small letters, digits, special symbols such as +, –, *, /, [ ] and whitespace
characters like space, tab and newline. The different types of symbols in the Python character set are listed below:
Letters a-z, A-Z
Digit 0-9
Special symbols ~ ! @ # $ % ^ & * () + = - {} [] < > ? | : “ ; ‘ ? , . /
White spaces Blank space, Tab(\t), Carriage return (\r), newline(\n)
12.8 COMMENTS IN PYTHON
Comments are lines in a Python program that are written to explain the code. They are written for programmer to read
so that the program can be understood more clearly. The Python interpreter ignores comments, so they do not affect
how the program runs. Comments are useful for describing what a piece of code does, making the program easier to
read and maintain.
12.8.1 Types of Comments
Here are the types of comments in Python:
1. Single-line Comment: A single-line comment in Python is used to explain a line of code or give short information
about the program. It starts with the hash symbol (#).
Example: x = 10 # This is a single-line comment
2. Multi-line Comment: A multi-line comment in Python is used to explain multiple lines of code or to write a detailed
description of a program. Python does not have a separate symbol for multi-line comments. Triple-quoted strings
are commonly used as multi-line comments when they are not assigned to a variable.
Symbols used in multi-line comments are:
• ''' (triple single quotes)
• """ (triple double quotes)
Anything written inside these quotes is ignored during execution when used as a comment. For example,
Program.py
File Edit Format Run Options Window Help
"""
This program
adds two numbers
and displays the result
"""
a= 10
b= 20
print(a + b)
420 Touchpad Computer Science (Ver. 3.0)-XI

