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    5                                 Variables Using

                                                                   Block Coding

                              Learning Outcomes
                           Introduction                                         What is Python?

                           What are Variables?                                  Naming Variables
                           Data Types                                           Performing Operations on Variables
                           Addition Operation using Block Coding

                      INTRODUCTION
                      In  the previous  chapters, you  have learnt the  basics of  algorithms, flowchart  and
                      pseudocodes. In this chapter, you are going to learn about another important component

                      of a program, variables.

                      WHAT IS PYTHON?

                      Python is a high  level object-oriented  programming language.  It is a general purpose
                      language with interactive features. Python is an open source software and is founded by
                      Guido Van Rossum in 1991. Python is extensively used in:

                         Web Development                    GUI Application Development                Data Analysis
                         Software Development               Scientific Applications

                      WHAT ARE VARIABLES?

                      Variable is a name given to a location in the memory, to store
                      values or data. For example, you must have seen your mother
                                                                                                      SUGAR       SALT
                      naming boxes in the kitchen. That box has a little storage capacity
                      and your mother gave it a name such as, salt, sugar, tea, etc.

                      Variables are also similar to a box or a packet. These packets can

                      be named, referenced and used to perform various mathematical operations.

                      So, a variable has a name (to refer to it), a type (kind of data it store and its size)
                      and a value (data). Usually variables are used to hold one or more values, result of
                      calculations, etc.

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