Expert Mastery — Series 2

Preview — 3 of 10 questions

What is the output of the following code?

javascript

import types

class Animal:
    pass

def bark(self):
    return f"{self.name} barks"

a = Animal()
a.name = "Rex"

a.speak = bark
print(a.speak())

a.speak2 = types.MethodType(bark, a)
print(a.speak2())

ARex barks, then Rex barks

BTypeError: speak() missing 1 required positional argument: 'self', then the same TypeError again for speak2

CTypeError: bark() missing 1 required positional argument: 'self', then Rex barks

DAttributeError: 'Animal' object has no attribute 'speak', then Rex barks

What is the output of the following code?

javascript

import sys

old_limit = sys.getrecursionlimit()
sys.setrecursionlimit(50)

def recurse(n):
    return recurse(n + 1)

try:
    recurse(0)
except RecursionError:
    print("RecursionError caught")

sys.setrecursionlimit(old_limit)
print("continues")

ARecursionError caught, then continues

BThe program crashes entirely — sys.setrecursionlimit cannot be lowered below the default at runtime.

CRecursionError caught, then a RuntimeError is raised immediately after, since the recursion limit was never restored.

DNothing is caught — RecursionError is a SystemExit subclass that bypasses ordinary except blocks.

What is the output of the following code?

javascript

code = "result = x + y"
namespace = {"x": 10, "y": 5}
exec(code, {"__builtins__": {}}, namespace)
print(namespace["result"])

try:
    exec("open('file.txt')", {"__builtins__": {}}, {})
except NameError as e:
    print("NameError:", e)

A15, then open('file.txt') executes normally, since exec() always has full access to the real builtins regardless of the namespace passed in.

BTypeError: exec() takes at most 2 arguments

CNameError: name 'x' is not defined — passing separate globals/locals dicts to exec() always breaks variable lookup.

D15, then NameError: name 'open' is not defined

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