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Python Basics · Functions · Lesson 14 of 36

Scope in Python

Concept

Scope in Python

Variables created inside a function are local to it. Variables created outside are accessible everywhere unless shadowed.

To modify a global variable from inside a function, you need the global keyword — without it, assigning to that name just creates a new local variable instead.

By the end of this lesson
  • Explain the core idea behind Scope in Python.
  • Predict output before running a change.
  • Test one realistic and one unusual input.
  • Use the result to make the next decision.
How to study this page
  1. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
x = "global"
def show():
    x = "local"
    print(x)

show()
print(x)
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Scope in Python. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Predict what the two print statements above output, then run the code.

Loading editor…

Console

Output will appear here...