Data tools · Python Cheat Sheets

Quick reference tables for the data libraries. Rows link to the matching lessons, and every example is tested so the results shown are the results you get.

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Python NumPy Cheat Sheet

NumPy stores numbers in fixed-type arrays and applies operations to every element at once: build with `np.array`, `np.arange` or …

Python pandas Cheat Sheet

pandas works on tables: select with `df["col"]`, `df.loc[...]` and `df[df["score"] > 70]`, clean with `fillna` and `dropna`, summ…

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