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Python Coding
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925 challenges 556 easy 323 medium 46 hard

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All Python Basics Strings & Text Lists & Arrays Dicts & Sets Functions & Closures OOP & Classes Data Structures & Algorithms Advanced Python Iterators & Generators Decorators & Context Managers Error Handling & Exceptions Regular Expressions Math & Number Theory Bit Manipulation Dynamic Programming Trees & Binary Trees Graphs & Graph Algorithms Recursion & Backtracking Greedy Algorithms Binary Search Two Pointers & Sliding Window Stacks & Queues Heaps & Priority Queues Linked Lists Matrix & 2D Arrays Datetime & Time Calculations Data Formats & Parsing SQL & SQLite Numpy & Vectorized Computing Cryptography & Hashing

Python Basics easy

Take n Items

Given a list and a non-negative integer n, return a new list containing the first n elements.

slicing list basics

Python Basics easy

Overlap two intervals

Given two closed intervals, return their overlap as a tuple or None if they do not overlap.

conditionals arithmetic intervals

Python Basics easy

Filter by Age

Filter a list of person dictionaries by age and return their names.

loops conditionals dictionaries

Python Basics easy

Limit and Offset Query

Write a function that returns a page from a dataset given limit and offset.

pagination list slicing

Python Basics easy

Rank Employees by Salary

Sort a list of employee dictionaries by salary descending, tie-break by name, and return ranked strings.

sorting dictionaries lists

Python Basics easy

Array mean and std

Implement the function array_stats that returns the mean and population standard deviation of a list of numbers.

statistics mean std

Python Basics easy

Broadcast Add Scalar

Add a scalar to every number in a 2D list and return a new 2D list without modifying the original.

nested-loops addition lists

Python Basics easy

Fancy Index Select

Given a 2D matrix and a list of row indices, select those rows in order and return them as a new 2D list.

indexing lists matrix

Python Basics easy

Cumulative Sum Vectorized

Implement a function that returns the cumulative sum of a list of numbers.

lists cumulative sum

Python Basics easy

Percentile Calculation

Given a list of numbers and a target value, return the percentile rank of that value in the list.

lists statistics math

Python Basics easy

Logging Filter

Given a list of log entries, return those matching a given severity level and containing a keyword.

strings conditionals loops

Python Basics easy

Order by Name

Implement a function that sorts a list of names alphabetically ignoring case, returning a new list.

sorting strings lists

Python Basics easy

Invariant checker

Implement check_invariant(a, b, c) that returns True when a equals b plus c and False otherwise, matching the given examples.

functions conditionals validation

Python Basics easy

Argmax along axis

Write a function that returns index positions of the maximum values along rows or columns of a 2D list.

lists max index

Showing 49–62 of 62 challenges · Python Basics

Python Basics — Python coding challenges

What you will find here

This page lists python basics challenges — real Python problems you solve in the browser IDE with instant test feedback. Each challenge includes a clear brief, starter code, and automated checks.

Challenges vs tutorials and quizzes

Challenges test what you can build under constraints. For guided teaching, use our Python tutorials. For quick checks, try quizzes or copy snippets from code samples.