In the context of this exercise, does merge order matter for Pandas dataframes?
Yes. Order of the merged dataframes will effect the order of the rows and columns of the merged dataframe.
When using the
merge() method, it will preserve the order of the left keys.
will preserve the order of
df1 when it is merged with
df2, then this order will be preserved when finally merging with
However, if order of the result dataframe actually does not matter to us, then the merge order will not matter. So,
will result in the same result, but in a different order than the previous example.