Python Medium

 

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

x = [1, 2, 3]
y = x
y.append(4)
print(x)

A) [1, 2, 3]
B) [1, 2, 3, 4] ✅
C) [4]
D) Error

Explanation: Lists are mutable, and y references the same object as x. So changes in y affect x.

2. Which of the following is not a valid keyword in Python?

A) pass
B) assert
C) eval
D) then ✅

Explanation: then is not a Python keyword.

3. What is the output?

print(bool(0), bool(3.5), bool(-1))

A) False True True ✅
B) False False False
C) True True True
D) Error

Explanation: In Python, 0 is False. Any non-zero value (positive or negative) is True.

4. Which of these data types is immutable?

A) list
B) dict
C) tuple ✅
D) set

Explanation: Tuples are immutable. Lists, dicts, and sets are mutable.

5. What will the following code output?

def f(a, b=2, c=3):
    return a + b + c

print(f(1, c=5))

A) 6
B) 8 ✅
C) 10
D) Error

Explanation: a=1, b=2 (default), c=5 (overridden) → 1+2+5 = 8.

6. Which of the following is correct about sets?

A) Sets allow duplicates
B) Sets are ordered
C) Sets are mutable ✅
D) Sets are indexed

Explanation: Sets are unordered and mutable, and they only store unique elements.

7. What is the output?

a = [1, 2, 3]
print(a * 2)

A) [2, 4, 6]
B) [1, 2, 3, 1, 2, 3] ✅
C) [1, 2, 3, 2]
D) Error

Explanation: List multiplication repeats the elements.

8. Function to get dictionary length?

A) count()
B) size()
C) len() ✅
D) length()

Explanation: len(dict) gives number of key-value pairs.

9. Output?

try:
    print(10/0)
except ZeroDivisionError:
    print("Error")
finally:
    print("Done")

A) Error
B) Error
C) Error Done ✅
D) Done Error

Explanation: ZeroDivisionError is caught → prints “Error”. Finally always executes → “Done”.

10. Which is not a valid import?

A) import math
B) import math as m
C) from math import *
D) include math ✅

Explanation: Python uses import, not include.

11. Output?

x = {1, 2, 3}
y = {3, 4, 5}
print(x & y)

A) {1, 2, 3, 4, 5}
B) {3} ✅
C) {}
D) Error

Explanation: & gives intersection → {3}.

12. id() function returns:

A) Identity of an object ✅
B) Memory size
C) RAM address
D) Data type

Explanation: Returns unique identity (usually memory reference).

13. Output?

print("Python"[-2])

A) o ✅
B) n
C) h
D) Error

Explanation: -2 index gives second last char → o.

14. Which creates a generator?

A) (x for x in range(5)) ✅
B) [x for x in range(5)]
C) {x for x in range(5)}
D) tuple(x for x in range(5))

Explanation: Parentheses comprehension creates generator.

15. strip() does what?

A) Removes whitespace at both ends ✅
B) Removes all characters
C) Splits string
D) Removes right spaces only

Explanation: strip() trims leading and trailing whitespace.

16. Function for max in a list?

A) largest()
B) max() ✅
C) biggest()
D) top()

Explanation: max(list) returns maximum value.

17. Output?

for i in range(2, 10, 2):
    print(i, end=" ")

A) 2 4 6 8 ✅
B) 2 3 4 5 6 7 8 9
C) 2 10
D) Error

18. Difference between is and ==?

A) No difference
B) is compares values, == compares identity
C) is compares identity, == compares values ✅
D) Both check values

19. Output?

def func(x=[]):
    x.append(1)
    return x

print(func(), func())

A) [1] [1]
B) [1,1] [1]
C) [1] [1,1]
D) [1,1] [1,1] ✅

Explanation: Default list is reused across calls.

20. Valid decorator?

A) @staticmethod ✅
B) @override
C) @synchronized
D) @virtual

21. Which operator is used for floor division?

A) /
B) // ✅
C) %
D) div

22. Output?

print(type(lambda x: x+1))

A) function
B) lambda
C) <class 'function'> ✅
D) error

23. Which of the following is true for Python’s with statement?

A) Used for loops
B) Ensures proper resource management ✅
C) Used only with files
D) Same as try-except

24. Which function is used to read a single line from a file?

A) readline() ✅
B) read()
C) readlines()
D) line()

25. Output?

a = (1, 2, 3)
a[0] = 5

A) (5,2,3)
B) [5,2,3]
C) Error ✅
D) None

Explanation: Tuples are immutable.

26. Which function gives absolute value?

A) abs() ✅
B) absolute()
C) fabs()
D) mag()

27. What is the output?

print(all([True, 1, "abc"]))

A) False
B) True ✅
C) Error
D) None

Explanation: all() returns True if all elements are truthy.

28. Which one is used for docstring access?

A) help() ✅
B) info()
C) doc()
D) getdoc()

29. Output?

print({i:i**2 for i in range(3)})

A) {1:1, 2:4, 3:9}
B) {0:0, 1:1, 2:4} ✅
C) [0,1,4]
D) Error

30. Which keyword is used to define anonymous blocks?

A) def
B) lambda ✅
C) func
D) block

31. Output?

print(type({}))

A) dict ✅
B) set
C) list
D) tuple

32. Which function is used to convert string to list of words?

A) split() ✅
B) listify()
C) tokenize()
D) explode()

33. Which is false about Python modules?

A) A module is a file with .py extension
B) Modules can contain functions & classes
C) Modules cannot be reused ✅
D) Modules can be imported

34. Output?

a = [1,2,3]
print(a[::-1])

A) [1,2,3]
B) [3,2,1] ✅
C) Error
D) None

35. Function to check datatype?

A) datatype()
B) type() ✅
C) class()
D) dtype()

36. Output?

print(any([0, "", False, 5]))

A) False
B) True ✅
C) None
D) Error

Explanation: any() is True if at least one element is truthy.

37. Which of these is not a Python data structure?

A) list
B) tuple
C) stack ✅ (not built-in, must be implemented)
D) dict

38. Output?

print(2 ** 3 ** 2)

A) 64
B) 512 ✅
C) 16
D) Error

Explanation: Exponentiation is right-associative → 3^2=9, then 2^9=512.

39. Which library is used for scientific computing in Python?

A) NumPy ✅
B) pandas
C) math
D) scipy

40. Output?

x = [1,2,3]
print(sum(x,10))

A) 6
B) 16 ✅
C) Error
D) 10

Explanation: sum([1,2,3],10) = 10+1+2+3=16.


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