Pandas Very Simple Percent of total size from Group by

Question

I\'m having trouble for a seemingly incredibly easy operation. What is the most succint way to just get a percent of total from a group by operation such as df.groupby

Answer 1

Getting good performance (3.73s) on DF with shape (3e6,59) by using: df.groupby('col1').size().apply(lambda x: float(x) / df.groupby('col1').size().sum()*100)