Combining Multiple Datasheets With Pandas Python

The code below calculates the mean','median','max','min' of the vals values that are in correlation to the dates month_changes . The code calculates the mean','median','max',

Solution 1:

As far as I understand this is what might give you the intended result: Merging the two datasets with an outer join and than replacing the resulting NaN with fillna(...)

Edit

In your code you are missing to assign the result of pandas join() to a variable, the function is returning a new dataset, so you could change it e.g. to return graph.join(graph_2)