make_animals: Walking Two Lists in Step to Build a List of Objects

Why does `for n in L1` make `L2[n]` meaningless, and what does looping over `range(len(L1))` fix?

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.

0 / 5 passed

Exercise 1 of 5

Line the two lists up by index

Two same-length lists arrive side by side: ages = [2, 5, 1] and names = ["blobfish", "crazyant", "parafox"]. Build one pair per position, in order, each holding the name first and the age second — so the pair at index 0 is ("blobfish", 2).

Assign the finished list of three tuples to pairs. Walk the positions, not the elements. (len() gives a list's length, range() turns a length into the positions, and lists grow with .append().)

# Pair each name with the age sitting at the same position.
ages = [2, 5, 1]
names = ["blobfish", "crazyant", "parafox"]

pairs = ...  # your code here — the list of (name, age) tuples, in index order

# Pair each name with the age sitting at the same position.
ages = [2, 5, 1]
names = ["blobfish", "crazyant", "parafox"]

pairs = ...  # your code here — the list of (name, age) tuples, in index order

Python runs in your browser

⌘/Ctrl + Enter runs

is a list of three 2-tuples

the first pair holds the name before the age

every pair takes both of its pieces from one position

←Previous Attribute Abuse From Outside, and a Dictionary of Animal Objects Next Hierarchies and Subclasses: The Three Moves a Subclass Can Make →