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Tricky Python: What Does This Print

What does this print? · Advanced · about 10 min

Read each short program and type exactly what it prints, with each printed line on its own line.

Example

x = [0] * 3
print(x)

prints

[0, 0, 0]

  1. Program 1

    def add(item, bag=[]):
    bag.append(item)
    return bag
add(1)
print(add(2))

  2. Program 2

    funcs = []
for i in range(3):
    funcs.append(lambda: i)
print([f() for f in funcs])

  3. Program 3

    funcs = [lambda i=i: i * 10 for i in range(3)]
print([f() for f in funcs])

  4. Program 4

    grid = [[0] * 2] * 3
grid[0][0] = 1
print(grid)

  5. Program 5

    def loud(x):
    print("checked", x)
    return x
print(loud(0) and loud(1))

  6. Program 6

    print(-9 // 4, int(-9 / 4), -9 % 4)

  7. Program 7

    s = "hi"
t = s
s += "!"
x = [1]
y = x
x += [2]
print(s, t)
print(x, y)

  8. Program 8

    nums = [1, 2, 2, 3]
for n in nums:
    if n == 2:
        nums.remove(n)
print(nums)