create REPORT.md

create scripts/generate_tasks.py

update python_medium.py

update python_hard.py

update python_easy.py

update python_easy.py

delete scripts/generate_tasks.py

update python_easy.py

update python_medium.py

update python_hard.py

update python_easy.py

update python_medium.py

update python_hard.py

update python_easy.py