excel_extract python3 -m venv venv && source venv/bin/activate && pip install pandas openpyxl xlsxwriter pip3 install pandas openpyxl xlsxwriter chmod +x timetable_extractor.py ./timetable_extractor.py ./timetable_extractor.py "04-Ge-Jiao-Shi-Shou-Ke-Shi-Jian-Biao.xlsx" "My_Formatted_Timetables.xlsx"