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    Variable Naming Convention:
                      Each language has its own set of rules to declare and initialise a variable. Python also has a
                      set of conventions to follow when naming a variable:

                      1.     A variable name can include letters, digits, and underscores.
                      2.     A variable name should be user-friendly.

                      3.     Variable names are case-sensitive.

                      4.     A variable name cannot start with a digit.
                      5.     A variable name cannot contain space characters.

                      Let’s take some examples and understand valid and invalid variable names:
                      Name, first.name, 2ndName, amount in $

                      In the above examples, only Name is a valid identifier or variable name.
                      Read the conventions and try to identify the reason for the invalid variable names.

                      Variable names are case-sensitive, which means names written in lowercase and uppercase
                      are treated as two different variables — like Age and age, which are two different variables.

                      Assigning Values to a Variable:
                      To assign a value to a variable, an equal sign (=) is used.

                      Age = 23

                      Here, Age is a variable with the value 23.

                      2.4.3 Data type
                      Now, how much memory a variable occupies depends on the type of data it is assigned.

                      Therefore, data types determine the amount of memory required to store the variable.
                      Python supports five standard data types:

                      1.       Number: The data types that store numeric values are called Python numbers. Python
                             has three kinds of numeric values: integer, float, and complex.

                             Example:

                                    X = 89      # X is an integer variable
                                    Y = 89.6    # Y is a float variable

                                    Z = 23j     # Z is a complex variable

                      2.       String: A string is a sequence of characters. These sets of characters are represented
                             using either single quotes (‘ ‘) or double quotes (“ “).
                             Example:

                                    Name = “Akbar”
                                    # or
                                    Name = ‘Akbar’

                    24                         KVS DELHI REGION 2025

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