Numerical Computing with Python

There's more...

Let's compare the speed difference between masking and dropping missing rows and boolean indexing. Boolean indexing is about an order of magnitude faster in this case:

>>> %timeit movie.mask(criteria).dropna(how='all')11.2 ms ± 144 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)>>> %timeit movie[movie['title_year'] < 2010]1.07 ms ± 34.9 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)