Pandas fill missing values in dataframe from another dataframe

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If you have two DataFrames of the same shape, then:

df[df.isnull()] = d2

Will do the trick.

visual representation

Only locations where df.isnull() evaluates to True (highlighted in green) will be eligible for assignment.

In practice, the DataFrames aren’t always the same size / shape, and transforming methods (especially .shift()) are useful.

Data coming in is invariably dirty, incomplete, or inconsistent. Par for the course. There’s a pretty extensive pandas tutorial and associated cookbook for dealing with these situations.

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