Python Coding
Challenges

Python Basics easy

Sum of digits

Return the sum of all decimal digits of a non-negative integer.

arithmetic loops

+8 pts 10m

Python Basics easy

Collatz steps

Count how many steps the Collatz sequence takes to reach 1 from n.

loops math

+10 pts 12m

Python Basics easy

Factorial (iterative)

Compute n! iteratively without recursion.

loops math

+8 pts 8m

Python Basics easy

Prime checker

Return True if n is a prime number.

math loops

+10 pts 10m

OOP & Classes easy

Stack class

Implement a Stack class with push, pop, peek, is_empty, and size.

OOP stack data-structures

+12 pts 15m

OOP & Classes medium

Linked list reversal

Implement a singly linked list and a function to reverse it in place.

linked-list OOP pointers

+28 pts 25m

OOP & Classes medium

Matrix addition operator

Implement a Matrix class that supports + and * operators.

OOP dunder matrix

+22 pts 20m

Advanced Python medium

2D Vector dataclass

Implement a Vector2D dataclass with +, -, scalar *, dot product, and magnitude.

dataclass OOP math

+20 pts 18m

Advanced Python hard

Data pipeline

Implement a Pipeline class supporting pipe chaining with the | operator.

functional OOP pipeline

+40 pts 35m

Advanced Python hard

Validated descriptor

Implement a TypedField descriptor that raises TypeError if the value is not of the expected type.

descriptors OOP metaclass

+40 pts 35m