1 Python Functions
1. What is a Function?
A function is a block of code that does a specific job.
In simple words:
👉 A function is like a machine
👉 You give input
👉 It does work
👉 It gives output
2. Why Use Functions?
Functions help us:
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Avoid repeating code
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Keep program clean
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Make code easy to understand
3. Create a Simple Function
We use the def keyword to create a function.
Example
4. Function with Parameters
Parameters are values passed into a function.
Example
5. Function with Multiple Parameters
Example
6. Function with Return Value
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return sends a value back. |
Example
7. Function Without Return
Example
8. Default Parameter Value
Example
9. Keyword Arguments
Example
10. Function with List
Example
11. Function Inside Function
Example
12. Common Beginner Mistakes
❌ Forgetting to Call Function
✔ Must call:
❌ Using Print Instead of Return
✔ Use return when value is needed.
13. Simple Practice Examples
Example 1: Check Even Number
Example 2: Find Square
Example 3: Welcome Message
14. Summary (Python Functions)
✔ Use def to create function
✔ Functions reduce repetition
✔ Parameters pass data
✔ return gives output
✔ Functions make code clean
📘 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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Function Arguments
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Lambda Functions
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Recursion
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Function Exercises
Just tell me 😊
