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    Scope of a variable

                     While creating a variable, you should also remember the limits of its usage. For example,
                     the boxes that your mother named, can be used in the kitchen and rarely outside of the
                     kitchen. Similarly, a variable can also be used in specific areas of a code, known as scope of
                     a variable.

                     The scope or accessibility of the variables defined in a program depends where you have

                     declared it in each program. Variable defined outside the scope cannot be accessed.

                     NAMING VARIABLES
                     Every variable in a program is unique and you need to allocate

                     variable a unique name. You cannot use the same name of a
                     variable more than once.

                     Variable name acts as an  identifier  for that variable and
                     suggest the information which it contains.

                                              Coding fact

                       In Covid-19  pandemic time, Avi Schiffmann,  a teenager,  coded one of the most visited
                       website across the globe ' ncov2019.live', to monitor COVID-19.

                       Example: If variable 'x' stores value 3, variable 'y' stores value 3. When         Subject Enrichment
                       we perform addition operation on 'x' and 'y', we will get the output as '6'.

                     Note: Variable is created, when you assign a value to it.

                     Rules for naming a variable in python:
                        Name your variables in such a way that it describes its purpose.
                        Variable name must begin with a letter or an underscore and can range from 1 to 255 characters.

                        No special character or spaces are allowed.
                        Uppercase and lowercase characters are distinct.
                        Keywords (reserved words) cannot be used as a variable.

                                              Coding fact

                       Co-founders of Apple, Steve Jobs and Steve Wozniak, in their teenage began their coding
                       careers.

                                                                                           Variables Using Block Coding  83

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