1. What is the output of print(type(5/2)) in Python 3?
- a) <class 'int'>
- b) <class 'float'>
- c) <class 'double'>
- d) <class 'number'>
Answer: B - Division in Python 3 always returns a float (
2.5 in this case).
2. Which method is used to add an element at the end of a list?
- a) append()
- b) insert()
- c) add()
- d) extend()
Answer: A -
append() adds a single element to the end: my_list.append(item).
3. What does the __init__ method do in a class?
- a) Initializes object attributes
- b) Destroys the object
- c) Converts object to string
- d) Imports modules
Answer: A - It's the constructor method called when an object is created.
4. Which operator performs integer division in Python?
- a) /
- b) //
- c) %
- d) |
Answer: B -
// returns the floor value (e.g., 5//2 gives 2).
5. What is the output of print("Hello" * 3)?
- a) HelloHelloHello
- b) Hello3
- c) TypeError
- d) Hello Hello Hello
Answer: A - Strings can be multiplied by integers for repetition.
6. Which collection is unordered and mutable in Python?
- a) list
- b) tuple
- c) set
- d) str
Answer: C - Sets are unordered and mutable:
{1, 2, 3}.
7. What does range(1, 10, 2) generate?
- a) [1, 3, 5, 7, 9]
- b) [1, 2, 3,..., 9]
- c) [2, 4, 6, 8]
- d) [0, 1, 2,..., 9]
Answer: A -
range(start, stop, step) generates numbers from 1 to 9 (exclusive) with step 2.
8. How do you open a file for reading in Python?
- a)
open("file.txt", "r") - b)
open("file.txt", "read") - c)
open("file.txt", "w") - d)
open("file.txt")
Answer: A - The
"r" mode opens a file for reading (default mode if omitted).
9. Which decorator is used to define a class method?
- a) @classmethod
- b) @staticmethod
- c) @method
- d) @class
Answer: A -
@classmethod receives the class (cls) as first argument.
10. What is the output of print([i for i in range(5) if i%2==0])?
- a) [0, 2, 4]
- b) [1, 3]
- c) [0, 1, 2, 3, 4]
- d) [2, 4]
Answer: A - This list comprehension filters even numbers from 0 to 4.
11. Which function converts a string to lowercase?
- a) lower()
- b) casefold()
- c) tolower()
- d) Both A and B
Answer: D - Both
lower() and casefold() convert strings to lowercase (casefold is more aggressive).
12. What is the output of print("Python"[1:4])?
- a) Pyt
- b) yth
- c) ytho
- d) Python
Answer: B - Slicing from index 1 to 4 (exclusive) gives 'yth'.
13. Which module is used for working with regular expressions?
- a) re
- b) regex
- c) pyre
- d) string
Answer: A - The
re module provides regex support: import re.
14. How do you create a virtual environment in Python?
- a) python -m venv myenv
- b) virtualenv myenv
- c) pip create venv myenv
- d) Both A and B
Answer: D - Both
venv (built-in) and virtualenv (third-party) can create virtual environments.
15. What is the purpose of __name__ == "__main__"?
- a) Checks if the script is run directly
- b) Imports a module
- c) Defines a class
- d) Creates a generator
Answer: A - It allows code to execute only when the script is run directly (not imported).
16. Which method is used to remove a key from a dictionary?
- a) pop()
- b) remove()
- c) delete()
- d) discard()
Answer: A -
my_dict.pop(key) removes the key and returns its value.
17. What does lambda x: x**2 create?
- a) A function that squares its input
- b) A list comprehension
- c) A generator expression
- d) A dictionary
Answer: A - Lambda creates anonymous functions:
square = lambda x: x**2.
18. Which exception is raised when a key is not found in a dictionary?
- a) KeyError
- b) ValueError
- c) IndexError
- d) LookupError
Answer: A - Accessing a non-existent key raises
KeyError.
19. What is the output of print("Hello".upper())?
- a) HELLO
- b) hello
- c) Hello
- d) hELLO
Answer: A -
upper() converts all characters to uppercase.
20. Which Python built-in is used to iterate over a sequence with indexes?
- a) enumerate()
- b) range()
- c) zip()
- d) iter()
Answer: A -
for i, item in enumerate(my_list): provides index-value pairs.