Week 10 Quiz

Predict, then check: what does this program print?

trip = ("Dock 4", "Dock 9", 12)
print(trip[2])

Select one.

• 12
• Dock 9
• 3
• TypeError

Predict, then check: what happens when this program runs?

spot = (3, 4)
spot[0] = 9
print(spot)

Select one.

• It prints (9, 4)
• It stops with TypeError and prints nothing
• It prints (3, 4)
• It prints 9 4

Predict, then check: what does this program print?

a = 1
b = 2
a, b = b, a
print(a, b)

Select one.

• 1 2
• 2 2
• 2 1
• 1 1

Predict, then check: what does this program print?

log = {"river book": 120, "atlas": 85}
log["field notes"] = 40
log["atlas"] = log["atlas"] + 15
print(log["atlas"])

Select one.

• 85
• 15
• 40
• 100

Predict, then check: what does this program print?

log = {"atlas": 85}
print(log["comics"])

Select one.

• KeyError
• None
• 0
• 85

Predict, then check: what does this program print?

log = {"river book": 120, "atlas": 85}
print(85 in log)

Select one.

• True
• False
• KeyError
• None

Predict, then check: what does this program print?

words = ["red", "blue", "red", "red", "blue"]
counts = {}
for w in words:
    counts[w] = counts.get(w, 0) + 1
print(counts)

Select one.

• {'red': 2, 'blue': 3}
• {'red': 1, 'blue': 1}
• {'red': 3, 'blue': 2}
• {'blue': 2, 'red': 3}

Predict, then check: what does this program print?

d = {}
d["zebra"] = 1
d["apple"] = 2
d["mango"] = 3
print(list(d))

Select one.

• ['apple', 'mango', 'zebra']
• ['mango', 'apple', 'zebra']
• ['zebra', 'mango', 'apple']
• ['zebra', 'apple', 'mango']

Select every program that stops with an error when it runs. Predict first, then run each one to check.

Select every option that applies.

• spot = (3, 4)
  spot[0] = 9

• shelf = {["atlas"]: 85}

• log = {"atlas": 85}
  print(log.get("comics", 0))

• print(len({1, 2, 2, 3}))

• print(type({}))

True or false: this program prints not logged yet, because the test title in log is False, so only the else branch runs.

log = {"river book": 120, "atlas": 85}
title = "comics"
if title in log:
    print(log[title])
else:
    print("not logged yet")

True or false.

• True
• False