Global Vs Local Variables in Python
You've written the same calculation three times. You've copied and pasted code blocks until your file is a nightmare. You know there has to be a better way.
There is. It's called functions.
This is not a 5-minute overview. This is the complete, start-to-finish guide to Python functions—the kind of deep dive I wish I had when I was starting. By the end of this 25-minute lesson, you won't just understand functions. You'll reach for them instinctively every time you see repetition.
📂 THE PYTHON TUTORIALFULL COURSE:
This video is part of my complete Python course. We don't just learn syntax—we build habits that matter.
🔍 WHAT YOU'LL LEARN (The Full Curriculum):
Part 1: The "Why"
Why functions exist (and why you've been craving them)
The problem with repeated code (demonstrated live)
Part 2: Your First Function
The def keyword explained
Function names that don't suck
Running your first function
Part 3: Parameters and Arguments
Positional vs. keyword arguments
Default parameters (and when to use them)
The *args and **kwargs mystery—solved
Part 4: The Return Statement
What return actually does
Functions that return vs. functions that just print
Returning multiple values (yes, you can)
Part 5: Scope
Local vs. global variables
The global keyword (and why to avoid it)
Common scope mistakes beginners make
THE GOLDEN RULE OF FUNCTIONS:
A function should do one thing and do it well.
If your function is doing five things, it's not a function—it's a monster. We'll show you how to slay it.
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