Week 12 Quiz

Predict, then check: this program saves the reading log and reads it back. What does it print?

daily = [12, 40, 25]
with open("reading_log.txt", "w") as f:
    for pages in daily:
        f.write(str(pages) + "\n")

total = 0
with open("reading_log.txt") as f:
    for line in f:
        total = total + int(line.strip())
print(total)

Select one.

• 77
• 124025
• TypeError
• 0

Predict, then check: what does this program print, or which exception type ends it?

daily = [12, 40, 25]
with open("reading_log.txt", "w") as f:
    for pages in daily:
        f.write(str(pages) + "\n")

total = 0
with open("reading_log.txt") as f:
    for line in f:
        total = total + line
print(total)

Select one.

• 77
• ValueError
• TypeError
• NameError

Predict, then check: what does the last line of this program print?

with open("tasks.txt", "w") as f:
    f.write("email\n")
    f.write("lunch\n")

with open("tasks.txt", "w") as f:
    f.write("gym\n")

with open("tasks.txt") as f:
    print(f.read().split())

Select one.

• ['email', 'lunch', 'gym']
• ['email', 'lunch']
• []
• ['gym']

Predict, then check: what does the last line of this program print?

daily = [12, 40, 25]
with open("reading_log.txt", "w") as f:
    for pages in daily:
        f.write(str(pages) + "\n")

with open("reading_log.txt") as f:
    lines = f.readlines()
print(len(lines[0]))

Select one.

• 2
• 3
• 1
• 12

Select every line this program prints.

try:
    n = int("42")
    print("ok", n + 1)
except ValueError:
    print("not a number")

try:
    n = int("forty-two")
    print("ok", n + 1)
except ValueError:
    print("not a number")

try:
    with open("no_such_file.txt") as f:
        print(f.read())
except FileNotFoundError:
    print("no file yet")

Select every option that applies.

• ok 43
• not a number
• no file yet
• ok 42
• FileNotFoundError

Predict, then check: what is the second line this program prints?

try:
    print("before")
    print(10 / 0)
    print("after")
except ZeroDivisionError:
    print("cannot divide by zero")
print("still running")

Select one.

• after
• still running
• ZeroDivisionError
• cannot divide by zero

Predict, then check: what does this program print, or which exception type ends it?

try:
    print(int("3.5"))
except ZeroDivisionError:
    print("caught it")

Select one.

• ValueError
• caught it
• 3
• ZeroDivisionError

Read the last line of the traceback: which exception type ends this program?

print(int("3.5"))

Select one.

• TypeError
• ValueError
• NameError
• SyntaxError

True or false: the program pages = 0, then print("before"), then print(10 / pages), then print("after") prints before and then stops with ZeroDivisionError, so the line that would print after never runs.

True or false.

• True
• False

Predict, then check: what does this program print, or which exception type ends it?

daily = [12, 40, 25]
try:
    total = 0
    for pages in daily:
        total = total + pages
    print(totl)
except:
    print("could not add the log")

Select one.

• 77
• Nothing prints
• could not add the log
• NameError