Top 30 python job crack interview quation with example

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Top 30 python job crack interview quation with example

1. What are Python’s key features?

Answer:

  • Easy to learn and read
  • Interpreted language
  • Dynamically typed
  • Object-oriented
  • Large standard library

2. What is the difference between deepcopy() and copy()?

Example:

import copy

a = [[1, 2], [3, 4]]
b = copy.copy(a)
c = copy.deepcopy(a)

a[0][0] = 99
print(b)  # [[99, 2], [3, 4]] -> shallow copy affected
print(c)  # [[1, 2], [3, 4]]  -> deep copy unaffected

3. What are Python data types?

Answer:

  • int, float, str, bool, list, tuple, set, dict, NoneType.

4. What is the difference between list and tuple?

Example:

my_list = [1, 2, 3]   # Mutable
my_tuple = (1, 2, 3)  # Immutable

5. What is Python’s __init__ method?

Answer:
It initializes class attributes when an object is created.

class Person:
    def __init__(self, name):
        self.name = name

p = Person("John")
print(p.name)

⚙️ Intermediate Python

6. Explain *args and **kwargs.

Example:

def test(*args, **kwargs):
    print(args)
    print(kwargs)

test(1, 2, 3, name="Alice", age=25)

7. What is list comprehension?

Example:

squares = [x**2 for x in range(5)]
print(squares)  # [0, 1, 4, 9, 16]

8. What is the difference between is and ==?

Example:

a = [1, 2]
b = [1, 2]
print(a == b)  # True (value)
print(a is b)  # False (different memory)

9. What is lambda in Python?

Example:

square = lambda x: x * x
print(square(5))  # 25

10. How do you handle exceptions?

Example:

try:
    x = 10 / 0
except ZeroDivisionError:
    print("Cannot divide by zero")
finally:
    print("Done")

Data Structures

11. How do you sort a dictionary by value?

Example:

d = {'a': 3, 'b': 1, 'c': 2}
sorted_d = dict(sorted(d.items(), key=lambda item: item[1]))
print(sorted_d)

12. Difference between append() and extend()?

Example:

a = [1, 2]
a.append([3, 4])  # [1, 2, [3, 4]]
a = [1, 2]
a.extend([3, 4])  # [1, 2, 3, 4]

13. How to remove duplicates from a list?

Example:

nums = [1, 2, 2, 3, 3]
unique = list(set(nums))
print(unique)

14. How do you merge two dictionaries?

Example:

a = {'x': 1, 'y': 2}
b = {'y': 3, 'z': 4}
merged = {**a, **b}
print(merged)

15. What is a generator?

Example:

def gen():
    for i in range(3):
        yield i

for val in gen():
    print(val)

Object-Oriented Programming

16. What is inheritance in Python?

Example:

class Parent:
    def greet(self):
        print("Hello from parent")

class Child(Parent):
    pass

c = Child()
c.greet()

17. What are class methods and static methods?

Example:

class Demo:
    @classmethod
    def class_m(cls):
        print("Class method")

    @staticmethod
    def static_m():
        print("Static method")

Demo.class_m()
Demo.static_m()

18. What is method overriding?

Example:

class A:
    def show(self):
        print("A")

class B(A):
    def show(self):
        print("B")

B().show()

Advanced Topics

19. Explain Python decorators.

Example:

def decorator(func):
    def wrapper():
        print("Before function")
        func()
        print("After function")
    return wrapper

@decorator
def hello():
    print("Hello")

hello()

20. What is a context manager?

Example:

with open("file.txt", "w") as f:
    f.write("Hello")
# No need to close manually

21. What is __str__ vs __repr__?

Example:

class Test:
    def __str__(self):
        return "User friendly"
    def __repr__(self):
        return "Debug info"

print(str(Test()))
print(repr(Test()))

22. What is monkey patching?

Example:

class Test:
    def greet(self):
        print("Hello")

def new_greet():
    print("Hi there")

Test.greet = new_greet
Test().greet()

23. What are Python modules and packages?

Answer:

  • Module: A Python file containing code.

  • Package: A collection of modules (a folder with __init__.py).

24. Explain Global Interpreter Lock (GIL).

Answer:
GIL ensures that only one thread executes Python bytecode at a time — limiting true parallelism in multi-threaded programs.

25. What are Python iterators?

Example:

nums = [1, 2, 3]
it = iter(nums)
print(next(it))

26. Explain difference between threading and multiprocessing.

  • Threading: Runs multiple threads (lightweight, shares memory).

  • Multiprocessing: Runs multiple processes (true parallelism).

27. What is the use of with statement?

It simplifies resource management — automatically closes or releases resources.

28. How do you manage virtual environments?

Example Commands:

python -m venv myenv
source myenv/bin/activate  # Linux/Mac
myenv\Scripts\activate     # Windows

29. What is the difference between @staticmethod, @classmethod, and normal methods?

Type Access to self Access to cls Purpose
Instance method ✅ ❌ Object-specific
Class method ❌ ✅ Class-level
Static method ❌ ❌ Utility function

30. Explain memory management in Python.

  • Python uses automatic garbage collection via reference counting and gc module.

  • The memory is managed by the Python private heap.

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