Using NumPy for array and matrix math in Python. Many mathematical operations, especially in machine learning or data science, involve working with matrixes, or lists of numbers.

When typing input, enter will jump you down to the next line, whereas shift-enter gets python to evaluate the code-cell. You can also press the run button in the menu bar instead of shift- enter.. A ...

so i want a date/time class that does math on times so i don't have to. like this: t1 = mytimeclass.time(10, 15) t2 = mytimeclass.time(4, 20) t3 = t2 - t1 ...or something. but the python datetime ...