python -m venv .venv
source .venv/Scripts/activate
python -m pip install jupyter
python -m pip install pandas
python -m pip install matplotlib
python -m pip install openpyxl
python -m freeze > requirements.txt
python -m venv .venv
source .venv/Scripts/activate
python -m pip install -r requirements.txt
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pandas_test.ipynb
a short introduction to pandas