How to use 'pandas group by count distinct' in Python

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90def crosscount(df, col_list):
91 """
92 tools for multy thread bi_count
93 """
94 assert isinstance(col_list, list)
95 assert len(col_list) >= 2
96 name = "count_"+ '_'.join(col_list)
97 df[name] = df.groupby(col_list)[col_list[0]].transform('count')
98 return df

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