Python Quizz

1. What will be the output of the following code?
import weakref

class A:
pass

a = A()
r = weakref.ref(a)
print(r())
del a
print(r())

2. Which method in the re module is used to search for a pattern in a string?

3. What will be the output of the following code?
def generator_func():
yield 1
yield 2
yield 3

g = generator_func()
print(next(g))
print(next(g))
print(next(g))
print(next(g))

4. What will be the output of the following code?
with open('test.txt', 'w') as f:
f.write('Hello, World!')

with open('test.txt', 'r') as f:
print(f.read())

5. What will be the output of the following code?
from functools import reduce

result = reduce(lambda x, y: x + y, [1, 2, 3, 4, 5])
print(result)

6. Which method is used to replace all occurrences of a pattern in a string?

7. Which method is used to read all lines of a file into a list?

8. What will be the output of the following code?

def func(x, y, z=3, *args, **kwargs):
return x + y + z + sum(args) + sum(kwargs.values())

print(func(1, 2, 3, 4, 5, a=6, b=7))

9. What is the purpose of the __new__ method in a Python class?

10. What will be the output of the following code?
def decorator_func(func):
def wrapper(*args, **kwargs):
print("Before")
result = func(*args, **kwargs)
print("After")
return result
return wrapper

@decorator_func
def say_hello():
print("Hello!")

say_hello()

11. What is the output of the following code?
from collections import deque

d = deque([1, 2, 3, 4])
d.appendleft(0)
d.pop()
d.extend([5, 6])
d.rotate(1)
print(d)

12. What is the purpose of the @functools.wraps decorator in Python?

13. What will be the output of the following code?
import unittest

class TestStringMethods(unittest.TestCase):
def test_upper(self):
self.assertEqual('foo'.upper(), 'FOO')

if __name__ == '__main__':
unittest.main()

14. What is the purpose of the GIL (Global Interpreter Lock) in Python?

15. What will be the output of the following code?
class A:
def __init__(self, x):
self.x = x

def __add__(self, other):
return A(self.x + other.x)

obj1 = A(1)
obj2 = A(2)
obj3 = obj1 + obj2
print(obj3.x)

16. What is the output of the following code?

a = [1, 2, 3]
b = a
a = a + [4, 5]
print(b)

17. Which method is used to read a specific number of bytes from a file?

18. Which module is used for creating processes in Python?

19. What is the purpose of the __slots__ attribute in a Python class?

20. What is the purpose of the await keyword in Python?

21. 56. What will be the output of the following code?
class A:
def __init__(self, x):
self.x = x

def __str__(self):
return f'Value: {self.x}'

obj = A(10)
print(obj)

22. Which of the following is true about Python's garbage collector?

23. What does the __getattr__ method do in a Python class?

24. Which module is used for asynchronous programming in Python?

25. What will be the output of the following code?
import re

pattern = re.compile(r'\d+')
result = pattern.sub('#', 'My number is 123 and my friend's number is 456')
print(result)

26. What will be the output of the following code?
import os

os.chdir('/tmp')
print(os.getcwd())

27. Which method in the os module is used to change the current working directory?

28. Which of the following is a Python memory management technique?

29. What does the following code do?
from contextlib import contextmanager

@contextmanager
def open_file(name):
f = open(name, 'w')
try:
yield f
finally:
f.close()

with open_file('test.txt') as f:
f.write('Hello, World!')

30. Which method is used to convert a string to a frozenset?

31. Which module is used to handle date and time in Python?

32. Which module is used for mocking in Python?

33. What is the purpose of the tell method in file handling?

34. What will be the output of the following code?
import pdb

def test():
pdb.set_trace()
print("Hello, World!")

test()

35. What is the output of the following code?
def func(x):
return lambda y: x + y

f = func(10)
print(f(5))

36. What is the purpose of the __call__ method in a Python class?

37. Which module is used for JSON manipulation in Python?

38. What will be the output of the following code?
import sys

a = []
b = a
print(sys.getrefcount(a))

39. What will be the output of the following code?
with open('test.txt', 'w') as f:
f.write('Hello, World!')

with open('test.txt', 'rb') as f:
print(f.read())

40. What will be the output of the following code?
import threading

def print_numbers():
for i in range(5):
print(i)

t1 = threading.Thread(target=print_numbers)
t2 = threading.Thread(target=print_numbers)

t1.start()
t2.start()

t1.join()
t2.join()

41. Which function is used to get the reference count of an object in Python?

42. What is the result of the following code?

class A:
def __init__(self):
self.a = 1
self.__b = 2

class B(A):
def __init__(self):
super().__init__()
self.a = 3
self.__b = 4

obj = B()
print(obj.a)
print(obj._A__b)

43. What is the purpose of the @patch decorator in the unittest.mock module?

44. Which of the following is true about Python inheritance?

45. What will be the output of the following code?

def decorator_func(func):
def wrapper(*args, **kwargs):
print("Wrapper executed this before {}".format(func.__name__))
return func(*args, **kwargs)
return wrapper

@decorator_func
def display():
print("Display function ran")

display()

46. What will be the output of the following code?
from collections import defaultdict

d = defaultdict(int)
d['a'] += 1
d['b'] += 2
d['c'] += 3
print(d['a'], d['b'], d['c'], d['d'])

47. Which module is used for debugging in Python?

48. What will be the output of the following code?
import re

pattern = re.compile(r'(\d{3})-(\d{2})-(\d{4})')
match = pattern.match('123-45-6789')
print(match.groups())

49. What does the following code do?

class C:
def __init__(self, x):
self.x = x

def __call__(self, y):
return self.x + y

obj = C(10)
print(obj(5))

50. What will be the output of the following code?

def func(a, b=[]):
b.append(a)
return b

print(func(1))
print(func(2))

51. What will be the output of the following code?
import multiprocessing

def print_numbers():
for i in range(5):
print(i)

p1 = multiprocessing.Process(target=print_numbers)
p2 = multiprocessing.Process(target=print_numbers)

p1.start()
p2.start()

p1.join()
p2.join()

52. What is the purpose of the seek method in file handling?

53. What is the purpose of the __del__ method in a Python class?

54. What will be the output of the following code?
from itertools import cycle

colors = ['red', 'green', 'blue']
cycle_colors = cycle(colors)
for _ in range(5):
print(next(cycle_colors))

55. What will be the output of the following code?
class A:
def __init__(self):
self.value = 42

obj = A()
print(getattr(obj, 'value'))

56. Which of the following is true about lambda functions in Python?

57. What is the purpose of the nonlocal keyword in Python?

58. Which module is used to create and manage complex data structures in Python?

59. What does the yield from statement do in Python?

60. What is the purpose of the partial function in the functools module?

61. What will be the output of the following code?
import heapq

h = [3, 1, 4, 1, 5, 9, 2, 6]
heapq.heapify(h)
print([heapq.heappop(h) for _ in range(3)])

62. What will be the output of the following code?
import logging

logging.basicConfig(level=logging.INFO)
logging.debug('Debug message')
logging.info('Info message')
logging.warning('Warning message')

63. Which of the following is true about namedtuples?

64. What is the purpose of the gc module in Python?

65. What will be the output of the following code?
import re

pattern = re.compile(r'\d+')
result = pattern.findall('My number is 123 and my friend's number is 456')
print(result)

66. Which of the following is true about context managers in Python?

67. Which method is used to dynamically create a class in Python?

68. What is the purpose of the set_trace method in the pdb module?

69. Which of the following is true about coroutines in Python?

70. What will be the output of the following code?
class A:
pass

obj = A()
print(type(obj).__name__)