concatenating along axis - dataframe merges - on index - meshgrid function methods defined for tuples in python starting with underscore microsoft excel files mil domain min method minimum function missing data - filling in - filtering out - mod function modf function modules momentum mongodb movielens data set example - moving window functions - binary moving window functions - exponentially-weighted functions user-defined mpkg file mro method mul method multiindex index object multiple profiles multiply function munging mutable objects - na data type names argument namespaces defined in python - naming trends in us baby names - example boy names that became girl names measuring increase in diversity - revolution of last letter - nan (not number) na_values argument ncols option ndarray boolean indexing - creating arrays - data types for - fancy indexing - indexes for - operations between arrays - slicing arrays - swapping axes in - transposing - nested code nested data types - nested list comprehensions - new york mta (metropolitan transportation authority) none data type normal function normalized timestamps nosql databases not number (nan) notebookcloud notnull method not_equal function npy files npz files nrows argument nuisance column numeric data types - numpy arrays in - concatenating - c_ object layout of in memory - replicating - reshaping - r_ object saving to file - splitting - subsets for - broadcasting - over other axes - setting array values by data processing using where function - data processing using arrays - index www it-ebooks info