Data Structures Interview Questions | Python | NextRound

1what is an arrayBeginner

2What are the common built-in data types in Python?Beginner

3How does Python handle Unicode internally, and what is the difference between str and bytes?Advanced

4What is the difference between a set and a frozenset?Beginner

5What are the time complexities of common list operations (indexing, append, insert, pop, search)?Intermediate

6What is the difference between a list and a tuple, and when would you choose one over the other?Beginner

7How does a Python dictionary achieve average O(1) lookup time internally?Advanced

8How would you design a Least Recently Used (LRU) cache using Python's built-in data structures?Advanced

9How would you efficiently remove duplicates from a list while preserving order?Intermediate

10What problem does collections.defaultdict solve, and how does it differ from using dict.setdefault?Intermediate

11Why are strings immutable in Python, and what performance implications does this have for repeated concatenation in a loop?Intermediate

12When would you use collections.deque instead of a list, and why?Intermediate

13What is the difference between str.format(), %-formatting, and f-strings? What are the performance and readability tradeoffs?Beginner

14Since Python 3.7, dictionaries preserve insertion order. How is this guaranteed internally, and what changed from earlier versions?Advanced