python - Referencing dataframe index when checking for duplicates -

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i looking duplicate entries in dataframe column. when find duplicate entry, want raise error message , point index. however, have many missing entries in column, not considered duplicates.

my code right looks like: 

 temp = df[pd.notnull(df['col1'])  dups = temp.duplicated('col1')   x in dups:        if x == true:              # print error message points index of x

i tried adding in row counter, pd.notnull messes count not consider duplicates. there way of finding duplicates?

thanks





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