Not all of these releases were tagged on GitHub and none of them have release notes on GitHub. Releases prior to 0.5.0 were not documented (although some were tagged on GitHub).

Read data from above file into dataframes (df1 and df2). Display number of partitions in df1. Create a new dataframe df3 from df1, along with a new column salary, and keep it constant 1000 append df2 ...