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learner questions

Sample n rows from each group in pandas
as.formula in R doesn't seem to accept a name that starts with a number followed by _
Write 2d dictionary into a dataframe or tab-delimited file using python
How to make syntactically correct names
How to get one hot encoded vector as in the table below
How to find weighted sum on top of groupby in pyspark dataframe?
pandas how to perform comparison on column
opencv - plot contours in an image
How to get back the index after groupby in pandas
Selecting a subset of functions from a list of functions in python

learner answers

How to get one hot encoded vector as in the table below