to install dependencies: pip install -r requirements.txt
print max/min for a given year: python .\weatherman.py e 2001 .\weatherdata\
averages for year/month: python .\weatherman.py a 2001/7 .\weatherdata\
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signs with colors for year/month in 2 lines python .\weatherman.py c 2001/7 .\weatherdata\
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signs with colors for year/month in 1 line python .\weatherman.py d 2001/7 .\weatherdata\