Python Variables

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 In Python, variables are used to store and manage data. Variables act as placeholders or containers for storing values. Here are some key points about variables in Python:


Variable Naming Rules:

   - Variable names can contain letters (a-z, A-Z), digits (0-9), and underscores (_).

   - Variable names must start with a letter or an underscore (no digits as the first character).

   - Variable names are case-sensitive, meaning `myVariable` and `myvariable` are considered different variables.

   - Python has reserved words (keywords) that cannot be used as variable names, such as if,  else, for, and while.


Variable Assignment:

   - Assigning a value to a variable is done using the  = operator.

   - Variables can hold various data types, such as integers, floats, strings, lists, dictionaries, and custom objects.


   Example:

   



 Dynamic Typing:

   - Python uses dynamic typing, meaning you don't need to specify the data type of a variable explicitly. Python infers the type based on the value assigned to the variable.


   Example:




Reassignment:

   - You can change the value of a variable by reassigning it with a new value.


   Example:




Printing Variables:

   - You can display the value of a variable using the print() instruction.


   Example:


   


Variable Naming Conventions:

   - It's a good practice to use descriptive variable names that convey the purpose of the variable.

   - Conventionally, variable names are written in lowercase with words separated by underscores (snake_case).


   Example:




Variables are fundamental in Python and play a crucial role in storing and manipulating data in your programs. Understanding how to use variables effectively is essential for writing Python code.

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