bigbug questions

• How to groupby the first level index and apply function to the second index in Pandas
• How to df.groupby(cols).apply(my_func) for some columns, while leave a few columns not tackled?
• How to fillna the last row of each group in Pandas?
• Assignment on column condition in Pandas [duplicate]
• How to add customized color letter in matplotlib?
• How to access file in pythonanywhere?
• How to barplot Pandas dataframe columns aligning by sub-index?
• How to get the sub_level index value of Pandas dataframe?
• How to replace&add the dataframe element by another dataframe in Python Pandas?
• How to speed up row selection by column value for big Pandas dataframe

bigbug answers