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groupby and assign number to each group pandas

group_vars = ['a']
df.merge( df.drop_duplicates( group_vars ).reset_index(), on=group_vars )

   a  b  index
0  1  1      0
1  1  1      0
2  1  2      0
3  2  1      1
4  2  1      1
5  2  2      1
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