Python Variables
1. What is a Variable?
A variable is like a box.
It is used to store information.
Example:
Here:
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age→ variable name -
25→ value stored in the box
2. Creating a Variable in Python
In Python, creating a variable is very easy.
You just write the name and give a value.
Example
Python automatically understands the type.
3. Python is Smart (No Data Type Needed)
You do NOT need to write:
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int
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float
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string
Python decides it by itself.
Example
The same variable can change value.
4. Variable Naming Rules (Very Important)
✔ Must start with a letter or _
✔ Can contain letters, numbers, _
❌ Cannot start with a number
❌ Cannot use Python keywords
Correct Variable Names
Wrong Variable Names
5. Assigning Multiple Values
Many Variables, Many Values
One Value, Many Variables
6. Printing Variables
Example
Print Text with Variable
7. Variables with User Input
Example
Number Input
8. Updating Variable Value
You can change a variable anytime.
Example
Output:
9. Deleting a Variable
Example
After deleting, x cannot be used.
10. Common Beginner Mistakes
❌ Using Quotes with Variable
Output:
✔ Correct:
❌ Forgetting Type Conversion
✔ Correct:
11. Simple Practice Examples
Example 1: Store and Print
Example 2: Add Two Numbers
Example 3: Update Variable
12. Summary (Python Variables)
✔ Variables store data
✔ Python decides data type
✔ Variable names have rules
✔ Values can be changed
✔ Input can be stored in variables
📘 Perfect for Beginner eBook
This chapter is ideal for:
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Python beginner books
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School & college students
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Self-learners
If you want next, I can write:
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Python Data Types (easy)
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Python Input & Output
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Operators
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if–else statements
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Practice questions with answers
Just tell me 😊
