Answers for "merge to dataframe pandas"

pandas left join

df.merge(df2, left_on = "doc_id", right_on = "doc_num", how = "left")

merge dataframe

In [46]: result = pd.merge(left, right, how="right", on=["key1", "key2"])

merge dataframe pandas

>>> df1.merge(df2, left_on='lkey', right_on='rkey')
  lkey  value_x rkey  value_y
0  foo        1  foo        5
1  foo        1  foo        8
2  foo        5  foo        5
3  foo        5  foo        8
4  bar        2  bar        6
5  baz        3  baz        7

pandas merge dataframes

import pandas as pd
pd.merge(restaurant_ids_dataframe, restaurant_review_frame, on='business_id', how='outer')