Python Pandas max value in a group as a new column

Question

I am trying to calculate a new column which contains maximum values for each of several groups. I\'m coming from a Stata background so I know the Stata code would be somethi

Answer 1

Using the approach from jpp above works, but it also gives a "SettingWithCopyWarning". While this may not be an issue, I believe the code below would remove that warning:

df = df.assign(max = df.groupby('group')['odds'].transform('max')).values