Track 5 · Lesson 5 of 12

Scope: local and global variables

Understand where a variable exists, why assigning inside a function creates a local variable, and why global state causes trouble.

You will be able to

• Explain that parameters and variables assigned inside a function are local to that call
• Predict when a function reads a global variable and when it creates a local one
• Diagnose NameError and UnboundLocalError caused by scope
• Replace global state with parameters and return values