Master Data Science and Data Analysis with Pandas by Arun Kumar

Author:Arun Kumar [Kumar, Arun]
Language: eng
Format: azw3, epub
Published: 2020-06-07T16:00:00+00:00

Merging with left join

A left join takes all the value from the left DataFrame (even the common ones).

df = pd.merge(sem1_df, sem2_df, on='subjects', how='left')

how = “left” makes the change

the left or right is decide as per the DataFrame passed to the merge operation. The 1st one (sem1_df here) becomes left and the 2nd one (sem2_df here) becomes right.

10.2.4

Merging with right join

By now it would be clear that what a right join would be doing. It takes all the rows (subjects) from the right DataFrame (sem2_df).

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