Page 65 - KEC Khaitan C7 Flipbook
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The output is displayed in the Python Shell window.




                           INPUT AND OUTPUT

                 Python provides two commonly used functions input() and print() for input and output
                 respectively.

                 input() FUNCTION
                 We use the input() function to take the user’s input while a program is being executed. (This
                 function also evaluates the expression whether the user has entered a string, number or list right
                 after receiving input.) The general syntax of the input() function is as follows:

                 Variable_name = input(<message to be displayed>)
                 Example:
                 >>> name = input("Enter your name: ")

                      Enter your name: Trackpad
                 By default, Python considers the input as string even if you entered a number as input. You cannot
                 perform calculations on string. To perform calculations, you need to convert the string into integer
                 or floating-point value.

                 To do so, Python provides following functions:
                     int(): It is used to change the input data value into integer. For example,

                     a = int(input("Enter a number "))
                     Now, the entered value is converted into integer value.
                     float(): It is used to change the input value into floating-point value. For example,
                    a = float(input("Enter a number "))
                     Now, the entered value is converted into floating-point value.

                 print() FUNCTION

                 We use the print() function to display the result on the screen. The content is written within the
                 parenthesis. To get the output, follow the given steps:
                 Step  1   Open the Python Shell window.

                 Step  2    In  front of the command prompt,  type  print("Hello  Students")  and press the  Enter
                           key. Do not forget to include the
                           double quotes (" ").

                 Step  3   The output  is  displayed  in  the
                 next line in the same Python Shell window.




                                                                                             Introduction to Python  63
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