Advanced Patterns — Series 3

Preview — 3 of 10 questions

What is the output of the following code?

javascript

x = 1_000_000
print(x)
print(int("1_000"))
try:
    print(int("1__000"))
except ValueError as e:
    print("ValueError:", e)

A1000000, 1000, ValueError: invalid literal for int() with base 10: '1__000'

B1_000_000, 1000, ValueError: invalid literal for int() with base 10: '1__000'

C1000000, TypeError: int() can't parse strings with underscores

D1000000, 1000, 1000 — int() silently collapses repeated underscores

What is the output of the following code?

javascript

class Vec:
    def __init__(self, val):
        self.val = val
    def __add__(self, other):
        return Vec(self.val + other)
    def __repr__(self):
        return f"Vec({self.val})"

v = Vec(1)
before_id = id(v)
v += 5
print(v)
print(id(v) == before_id)

AVec(6), True

BVec(6), False

CTypeError: unsupported operand type(s) for +=: 'Vec' and 'int'

DVec(1), True

What is the output of the following code?

javascript

data = [1, 2, 3, 4, 5, 6, 7, 8]
results = [y for x in data if (y := x * x) > 20]
print(results)
print(y)

A[25, 36, 49, 64], 1

B[25, 36, 49, 64], NameError: name 'y' is not defined

C[25, 36, 49, 64], 64

D[5, 6, 7, 8], 64

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