Page 234 - Ai_V1.0_Class9
P. 234

Unlike  other  programming  languages,  variables  in  Python  are  not  created  before  use.  They  are  created
              automatically when a value is assigned to them by using the assignment operator (=).
              A variable assigned a value of one type can be re-assigned a new value of a different type, as shown below:
                >>>a = 20
                >>>a
                20
                >>>a = "hello"
                >>>a
                'hello'
              There are different ways of assigning values to variables in Python:
                 • Method1: Assigning different values to different variables on different lines.

                >>>a = 5
                >>>b = 10.5
                >>>c = "hello"
                 • Method2: Assigning different values to different variables on same line.

                >>>a = 5; b = 10.5; c = "hello"
                          OR

                >>>a, b, c = 5, 10.5, "hello"
                 • Method3: Assigning same value to different variables on same line.

                >>>a = b = c = 10



                           Brainy Fact

                  Python  is  a  case-sensitive  language  where  uppercase  and  lowercase  characters  have  different
                  meanings. Name and name are two different variables.




                       Data Types


              Data types specify the kind of a value a variable can store. It helps us to identify the kind of operation that can
              be performed on that specific data type. Every value in Python has a data type. Some of the standard built-in
              data types of Python are:

                                                          Data Types




                           Numbers          None           Boolean        Sequences          Sets            Maps





                   int       float    complex                       string    list    tuple                dictionary

                 • Numbers: Data with a numeric value falls into this category. It can be integer, float and complex. Python will
                 automatically convert a number from one type to another if needed. Following are some number types:



                    232     Artificial Intelligence Play (Ver 1.0)-IX
   229   230   231   232   233   234   235   236   237   238   239