Page 124 - Plus V4 with Adobe class 6
P. 124

Declaring and Initializing a Variable

        In Python, variables are declared and initialized at the same time in the following way:

            a = 10

            b = 20

            print ("a=", a)
            print ("b=", b)
        On the output screen, a = 20 and b = 40 will be printed. You can also assign the same value to multiple
        variables at the time in the following way:

            a = b = 20

            print ("a=", a)
            print ("b=", b)
        On the output screen, a = 20 and b = 20 will be printed.

        You can also assign multiple values to multiple variables in the same line in the following way:

            name, age, grade="Deepak", 12, ‘VII’

            print ("Name is", name)

            print ("Age is", age)

            print ("Grade is", grade)
        On the output screen, Name is Deepak, Age is 12 and Grade is VII will be printed.

        You must follow the given rules while creating and naming the variables:

            A variable name must start with a letter or underscore character.
            A variable name cannot start with a number.
             A  variable  name can  only  contain  alphanumeric  characters (all  the  letters of  the  alphabet  and
           numbers) and underscores (_).

            Variable names are case-sensitive.
             Variable names cannot contain any special character or symbol.



                 Double Tap



               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 contains. For example, a person’s name must be
        stored as a string value whereas the person’s age must be stored as an integer.



            122  Plus (Ver. 4.0)-VI
   119   120   121   122   123   124   125   126   127   128   129