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90 def 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