Tracing Nested Calls with the Environment Model

When one function call is nested inside another, how does putting the outer call on hold and building a fresh scope for the inner one let you trace the whole thing down to a single value?

Finger exercises

Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.

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Exercise 1 of 5

Write a lambda

Write an anonymous function — a lambda — that takes one input and returns its cube (the input raised to the third power). Assign the lambda to cube.

(Hint: ** is Python's exponent operator.)

# Write a lambda that returns the cube of its input.
cube = lambda x: ...  # your code here

# Write a lambda that returns the cube of its input.
cube = lambda x: ...  # your code here

Python runs in your browser

⌘/Ctrl + Enter runs

is a function you can call

cubes a positive number

handles a negative input

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