• Integer add without arithmetic operators: C++
• Bitfield manipulation functions (test, set, clear): C++

• The Labyrinth (connected component size with DFS): C++
• Dijkstra's single-source shortest-paths algorithm: Python

• Deck shuffle: C++
• Mergesort: Python, C++
• Heapsort: Python
• Bubble sort: Python

• Breadth-first search on a graph: Python
• Depth-first search on a graph: Python
• Binary search on an array: Python

• Implementation of a queue using two stacks: Python
• Simple queue implementation: Python
• Simple stack implementation: Python

• Linked list removal of node in middle of list: Python
• Linked list duplicate node removal: Python
• Linked list node implementation: Python

• URL encode whitespace of string in-place: C++
• C-string reverse: C++
• String permutation check: Python
• String rotation check: Python, C++
• Simple string compress: Python, C++
• String replace: Python

• Codeforces Problem 1A ("Theatre Square"): C++
• Data type size listing: C++
• String concatenation benchmark: C++
• FizzBuzz: C++
• Standing ovation: Python
• Vietnam snake: Python

Python unit tests kept alongside target files in subdirectories, so to run all unit tests within a category:

cd target_directory
python -m unittest discover --pattern=test*.py

I use the Google Python style guide to format my Python code, and pylint as a quick tool to check adherence to the formatting style.

Install pylint on Debian/Ubuntu and run it on Python source:

sudo apt-get install pylint
pylint source.py