update python_medium.py

update python_hard.py

update python_easy.py

update python_hard.py

update python_hard.py

update python_medium.py

update python_easy.py

update dev/solution.cs

Запрос на слияние 'aecomerce-dev' (#1) из aecomerce-dev в master

docs: add contribution variant for branch refs/heads/aecomerce-dev

create dev/solution.cs

docs: add contribution variant for branch refs/heads/aecomerce-solution1

update spec/codex.md