如何从现有数据框创建新数据框？

Question

I have a data frame like this Main DataFrame . How Can I extract new data frame from it like: Second DataFrame

I know df['Group'].value_counts().index shows me counts of each 'Group' but I don't know how to create new dataframe with it.

Answer 1

You get a new dataframe by using for example groupby like this to do this counting:

df.groupby("Group", as_index=False).size()

Other interesting options for groupby that you might want to use depending on use case are dropna=False and sort=False .

And to rename the size column to counts you use can use rename: .rename(columns={'size': 'Count'})