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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  133

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