Python Online MCQ Test

1. What will be the output of the following code concerning decorators?

def my_decorator(func):
    def wrapper():
        print("Something is happening before the function is called.")
        func()
        print("Something is happening after the function is called.")
    return wrapper

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

say_hello()

2. What will be the output of the following code regarding isinstance and inheritance?

class A:
    pass

class B(A):
    pass

obj_b = B()
print(isinstance(obj_b, A))
print(isinstance(obj_b, B))

3. In Python 3, whatever you enter as input, the input() function converts it into a string.

4. When would you typically use a tuple instead of a list?

5. Which of the following is the most Pythonic way to swap the values of two variables a and b?

6. Which of the following is an effective way to handle race conditions in a multithreaded Python program?

7. Select all correct way to remove the key marks from a dictionary

student = { 
  "name": "Emma", 
  "class": 9, 
  "marks": 75 
}

8. What will be the output of the following code

s = {1, 'PYnative', ('abc', 'xyz'), 'abc'} 
print(s)

9. How do you correctly create a tuple containing only one element, say the number 5?

10. What is the purpose of a “raw string” (prefixed with r or R) in Python?

11. Bitwise shift operators (<<, >>) has higher precedence than Bitwise And(&) operator

12. What is the output of the following code?

valueOne = 5 ** 2
valueTwo = 5 ** 3

print(valueOne)
print(valueTwo)

13. Given t = (1, 2, 3, 4, 5), which assignment correctly unpacks the first, last, and middle elements into separate variables?

14. What is the output of the following code?

d1 = {'a': 1, 'b': 2}
d2 = {'b': 3, 'c': 4}
d1.update(d2)
print(d1)

15. Which of the following best describes a Python lambda function?

16. Which of the following is a key difference between a thread and a process in Python?

17. What is the output of print(2 ** 2 ** 2)

18. What will be the output of the following code

values = [10, 20, 30, 40, 50]
print(values[::2])

19. Select all correct ways to copy a dictionary in Python

20. What will be the output of the following Python code?

numbers = [1, 2, 3, 4, 5]
squared_numbers = list(map(lambda x: x*x, numbers))
print(squared_numbers)

21. What is the primary purpose of the yield keyword in Python?

22. What is the output of the following code?

x = 5
print(eval('x + 3'))

23. Bitwise shift operators (<<, >>) has higher precedence than Bitwise And(&) operator

24. What is the output of the following code, considering argument passing?

def modify_list(lst):
    lst.append(4)
    lst = [5, 6]

my_list = [1, 2, 3]
modify_list(my_list)
print(my_list)

25. Which operator has higher precedence in the following list

26. What is the primary purpose of *args and **kwargs in Python function definitions?

27. What will be the output of the following code

sampleList = [10, 20, 30, 40]
del sampleList[0:6]
print(sampleList)

28. What is a key characteristic of a Python generator function?

29. Which operation returns elements that are in set_A or set_B, but not in both?

30. What is the output of the following code?

sampleList = ["Jon", "Kelly", "Jessa"]
sampleList.append(2, "Scott")
print(sampleList)

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

aList = ["PYnative", [4, 8, 12, 16]]
print(aList[0][1])    
print(aList[1][3])

32. What is the result of 0.1 + 0.2 == 0.3 in Python?

33. What is the output of the following code?

def multiply(a, b):
    return a * b

def apply_operation(func, x, y):
    return func(x, y)

result = apply_operation(multiply, 5, 3)
print(result)

34. What is the output of the following code?

var = "James" * 2  * 3
print(var)

35. What is the output of the following code?

data = {"a": 1, "b": 2, "c": 3}
keys = data.keys()
data["d"] = 4
print(list(keys))

36. What is the output of the following code?

data = {"name": "John", "age": 30}
print(data.get("city", "Unknown"))

37. Which of the following is incorrect file handling mode in Python

38. What is the output of the following variable assignment?

x = 75
def myfunc():
    x = x + 1
    print(x)

myfunc()
print(x)

39. What is the output of the following code?

x = 10
y = 3
print(x % y)

40. Given the nested if-else below, what will be the value x

x = 0
a = 5
b = 5
if a > 0:
    if b < 0: 
        x = x + 5 
    elif a > 5:
        x = x + 4
    else:
        x = x + 3
else:
    x = x + 2
print(x)