pandas is a fast, powerful, flexible and easy to use open source data analysis and manipulation tool, built on top of the Python programming language.
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10 minutes to pandas
https://pandas.pydata.org/docs/getting_started/10min.html -
Merge, join, and concatenate
https://pandas.pydata.org/docs/user_guide/merging.html -
Time series / date functionality
https://pandas.pydata.org/docs/user_guide/timeseries.html