Two different data frames can be stacked either horizontally or vertically by the concat(), append() and join() functions in pandas.
Concat works best when the dataframes have the same columns and can be used for concatenation of data having similar fields and is basically vertical stacking of dataframes into a single dataframe.
Append() is used for horizontal stacking of dataframes. If two tables(dataframes) are to be merged together then this is the best concatenation function.
Join is used when we need to extract data from different dataframes which are having one or more common columns. The stacking is horizontal in this case.
Before going through the questions, here’s a quick video to help you refresh your memory on Python.
append in python
