python - pandas syntax for more complex sql query -


i looking pandas syntax following aggregation pandas dataframe. cannot find example how accomplish following sql query in pandas.

#sum , divide select  click,  ctr,  sum(click)/sum(imp) ctr mytable group website  #normalize each subgroup  select  imp,  imp/sum(imp) on (partition website) n_imp mytable

sql:

#normalize each subgroup  select  imp,  imp/sum(imp) on (partition website) n_imp mytable

pandas:

df[['website','imp']].assign(n_imp=df['imp']/df.groupby('website')['imp'].transform('sum'))

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