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Variable names are case-sensitive.
Variable names cannot contain any special character or symbol.
Let’s CatCh uP
Circle the incorrect variable in the following code.
Roll no = 201 Student Name = "Chirag" Section = 'A'
DATA TYPES
A data type specifies the type of value a variable can contain. For example, a person’s name must
be stored as a string value whereas the person’s age must be stored as an integer. Data types in
Python are:
int: Positive or negative whole numbers (without any fractions). Example: a = 3
float: Any real number in which a fraction is denoted by a decimal symbol. Example: a = 3.5
string: A string value is a collection of one or more characters put in single or double quotes.
Example: a="hello"
COMMENTS IN PYTHON
Comments in Python can be used to explain parts of the code. It can also be used to hide the code as
well. Comments enable us to understand the way a program works. In Python, any statement starting
with # symbol is known as a comment. Python does not execute comments. Comments are not a part
of the program, but they do enhance the interactivity of the program and make it readable. Python
supports two types of comments: Single line comment and Multiline comment.
Single Line Comment
In case, a user wants to specify a single line comment, then comment must start with the symbol #.
Example:
Program: Output:
# printing a string Hello World
print("Hello world")
Introduction to Programming 117

