Python variables

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Python Variables – A Beginner's Guide

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What Is a Variable?

A variable in Python is like a container that holds data. Think of it as a label you stick on a box, so you know what’s inside.


Why Use Variables?

Variables help you:

  • Store information
  • Reuse it later
  • Change it easily

📝 Creating a Variable

To create a variable in Python, just write a name, an equal sign =, and a value.

name = "Alice"
age = 25
height = 5.6

Here:

  • name is a variable storing a string
  • age is storing an integer
  • height is storing a floating-point number

🗃 Variable Naming Rules

✅ You can:

  • Use letters, numbers, and underscores (_)
  • Start with a letter or underscore

❌ You can’t:

  • Start with a number
  • Use spaces or symbols like @ or !

✅ Valid:

first_name = "John"
user2 = "Jane"
_temp = 50

❌ Invalid:

2user = "Error"
user-name = "Oops"


🔄 Changing a Variable's Value

You can update a variable at any time:

score = 10
score = 20  # Now score is 20


Python Is Dynamically Typed

You don’t have to tell Python the type of variable. It figures it out on its own:

x = 10      # int
x = "ten"   # now it's a string

This is called dynamic typing.



Example with Numbers

a = 5
b = 3
sum = a + b
print("Sum is:", sum)  # Output: Sum is: 8


🗣 Example with Strings

first = "Python"
second = "Rocks"
message = first + " " + second
print(message)  # Output: Python Rocks


Best Practices

  • Use descriptive names: 
    x = 10         # Bad
user_age = 10  # Good
  • Stick to lowercase_with_underscores for readability


📌 Quick Recap

Feature Example
Create variable name = "Alice"
Update value name = "Bob"
Use in math total = a + b
Combine text msg = first + last


✅ Try It Yourself

Copy and paste this code into a Python editor:

name = "Charlie"
age = 30
print(name, "is", age, "years old.")

You’ll see: Charlie is 30 years old.



watch following video if you like to understand in video format. 



In this video you can see :


What is a variable ?
Why to use variables?
What are python variables and how they are used?
How python deals with variables and how these are declared?

                Next Up: – Python Data Types
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