23/02/2026
🚀 The Biggest Mistake Beginners Make With Python Functions
You know what functions are.
But you’re still using them incorrectly.
When I first started learning Python, I thought functions were just a cool way to cut down on code repetition.
But that’s not even close to the truth.
The biggest mistake beginners make is this:
👉 Using print() instead of return.
Let’s look at an example:
def add(a, b):
print(a + b)
result = add(2, 3)
print(result) # None
Looks good, right? But it’s not reusable.
Now let’s look at this instead:
def add(a, b):
return a + b
result = add(2, 3)
print(result) # 5
Here’s the key difference:
✔ print() prints output
✔ return returns the value to your program
And that’s where the magic of programming begins.
Functions aren’t about cutting down lines of code.
Functions are about:
• Thinking in modules
• Organized code
• Scalable code
• Debugging made easy
When I began using return correctly, my code transformed into this:
– Organized
– Easy to test
– Ready for a larger project
Before: messy code repetition
After: reusable code blocks
It’s a small change. But it makes a huge difference.
If you’re learning Python, get this right early on.
