Take Quiz - Python Interview Challenge ⭐

1. What is the difference between mutable and immutable objects in Python?

Mutable objects cannot be changed after creation Mutable objects can be changed after creation, while immutable objects cannot be changed Both are always immutable Both are always mutable

2. Which of the following Python objects is immutable?

List Dictionary Set Tuple

3. What happens when you pass a list to a Python function and modify the list inside the function?

The original list can be modified because the function receives a reference to the same object Python always creates a deep copy The list becomes immutable The function cannot modify lists

4. What is the difference between a module and a package in Python?

A module is always larger than a package A package can contain modules, while a module is generally a single Python file They are exactly the same A module can only contain classes

5. What is the purpose of __init__.py in a Python package?

It is used only to start the Python interpreter It can initialize a package and historically marks a directory as a regular Python package It is required for every Python file It is used to create database tables

6. What is the difference between import module and from module import name?

There is no difference import module imports the module, while from module import name imports a specific name from it Both import only classes from module import name imports the entire operating system

7. What is the purpose of if __name__ == "__main__": in Python?

It makes every function private It runs a block when the file is executed directly, but not when it is imported as a module It creates a new class It handles exceptions

8. What is serialization in Python?

Deleting an object from memory Converting an object into a format that can be stored or transmitted Sorting a list Creating a Python class

9. Which Python module is commonly used for JSON serialization and deserialization?

os sys json math

10. What is the difference between json.dumps() and json.loads()?

Both convert JSON to Python objects dumps() converts a Python object to a JSON string, while loads() converts a JSON string to a Python object dumps() reads a file and loads() writes a file Both convert Python objects to JSON strings

11. What is an iterator in Python?

An object that can only store strings An object that provides values one at a time using __next__() A database connection A Python package

12. Which methods are commonly used to implement an iterator?

__init__() and __str__() __open__() and __close__() __iter__() and __next__() __start__() and __stop__()

13. What exception is raised when an iterator has no more values?

ValueError IndexError StopIteration TypeError

14. What will be the output? x = [1, 2, 3] print(x * 2)

[2, 4, 6] [1, 2, 3, 1, 2, 3] [1, 2, 3, 2] Error

15. What will be the output? a = [1, 2, 3] b = a a.append(4) print(b)

[1, 2, 3] [4] [1, 2, 3, 4] Error

16. What is the time complexity of dictionary lookup on average in Python?

O(n) O(1) O(log n) O(n²)

17. Why are dictionaries generally fast for key-based lookup?

Because dictionaries are always sorted Because dictionaries use a hash table internally Because dictionaries use linked lists only Because dictionaries store only integers

18. What is the average time complexity of searching for an element in a Python list?

O(n) O(1) O(log n) O(log n)

19. What is the difference between append() and extend() for a list?

append() adds one object as an element, while extend() adds elements from an iterable append() sorts the list and extend() reverses it Both always behave exactly the same extend() can only add strings

20. What will be the output? x = [1, 2] x.extend([3, 4]) print(x)

[1, 2, [3, 4]] [1, 2, 3, 4] [3, 4] Error

21. What is the difference between remove(), pop(), and del for lists?

All three methods do exactly the same thing remove() deletes by value, pop() removes by index and returns the item, and del can delete an item, slice, or variable pop() can only delete by value remove() always returns the removed item

22. What is the difference between sort() and sorted()?

Both always modify the original list sort() modifies the list in place, while sorted() returns a new sorted list sorted() works only with tuples sort() returns a new list and never changes the original

23. What will be the output? numbers = [3, 1, 2] result = sorted(numbers) print(numbers) print(result)

[1, 2, 3] and [1, 2, 3] [3, 1, 2] and [1, 2, 3] [3, 1, 2] and [3, 1, 2] Error

24. What is the purpose of virtual environments in Python?

To make Python code run without an operating system To isolate project dependencies and package versions To automatically convert Python into Java To increase internet speed

25. What is pip in Python?

A Python interpreter A debugging framework A package management tool used to install and manage Python packages A database management system

Python Interview Challenge ⭐

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