使用 Pandas 1.0.1，如果
df = df.merge(df2, on=some_column)
产量
File /home/torstein/code/fintechdb/Sheets/sheets/gild.py, line 42, in gild
df = df.merge(df2, on=some_column)
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/frame.py, line 7297, in merge
validate=validate,
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 88, in merge
return op.get_result()
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 643, in get_result
join_index, left_indexer, right_indexer = self._get_join_info()
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 862, in _get_join_info
(left_indexer, right_indexer) = self._get_join_indexers()
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 841, in _get_join_indexers
self.left_join_keys, self.right_join_keys, sort=self.sort, how=self.how
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 1311, in _get_join_indexers
zipped = zip(*mapped)
File /home/torstein/anaconda3/lib/python3.7/site-packages/pandas/core/reshape/merge.py, line 1309, in <genexpr>
for …