What you will learn
Produce values lazily and understand a recursive base case.
Common mistake
Every recursive path must move toward a reachable base case.
Generators and recursion
PRACTICE LAB
Python source · .pyRead. Edit. Run.
Experiment with the program below. Your code and input are sent to the selected compiler only when you run it.
Tab indents · Shift+Tab unindents · Esc then Tab leaves the editor · Ctrl/Cmd+Enter runs · Ctrl/Cmd+S saves a draft
Changes save automatically to your account.
Input / output example
Example inputNo input required.Expected output for the original program
[4, 3, 2, 1]
Output will appear here.
Debugging Lab
Interactive Python Object Visualizer
Educational simulation — object identities and execution steps are illustrative.