Joining multiple DataFrames only supported for joining on index

pandas中多个dataframe想进行按列操作时，需要用join函数，根据函数参数列表

DataFrame.join(self, other, on=None, how='left', lsuffix='', rsuffix='', sort=False)

当指定了on等于某一列后，报错：Joining multiple DataFrames only supported for joining on index

即提示多个dataframe只能按照index进行join

此时

rst2=df0.join(rst1)
rst3=rst2.fillna(-1)
rst3[['体育资讯_m_visit_cnt_count_1m','体育资讯_m_visit_cnt_mean_1m']]

即可

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