A variable in Python is a name that refers to a memory location where data is stored. Variables allow you to store, modify, and access data during the execution of a program. Unlike some other programming languages, Python variables are dynamically typed, meaning you do not need to explicitly declare their data type.

Syntax:

variable_name = value

• variable_name: A valid identifier that follows Python's naming conventions.
• value: The data assigned to the variable.

Example:

name = "Nihar"
age = 25
height = 6.0
is_student = True

In this example:

• name is assigned a string ("Nihar").
• age is assigned an integer (25).
• height is assigned a float (6.0).
• is_student is assigned a boolean value (True).

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Variable Naming Rules

1. Case-sensitive: Variable names are case-sensitive. age and Age are two different variables.
2. Must start with a letter or underscore: Variables can start with a letter (a-z, A-Z) or an underscore (_), but not a number.
3. Cannot use reserved keywords: Python keywords like class, if, while, etc., cannot be used as variable names.
4. No spaces allowed: Use underscores to separate words (my_variable).

Example:

first_name = "Nihar"  # Valid
1st_name = "Nihar"    # Invalid (cannot start with a number)

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