Replace column values with last occurance value based on another column

Question

I have a pandas dataframe has two columns, code and name,

each duplicated code may have different names,

How can I replace name for each code with last occurrence for each one

code	name
1	3
1	6
2	5
3	4
1	7

Required output

code	name
1	7
1	7
2	5
3	4
1	7

Asked By: hsmbarakat

||

Source

Answer 1

You can use pd.groupby() to group by the column code and get the last value from the column name for each value of code. Use transform to get the complete column back and save it under the column name:

df['name'] = df.groupby('code').name.transform('last')
print(df)

Output:

   code  name
0     1     7
1     1     7
2     2     5
3     3     4
4     1     7

Answered By: T C Molenaar

Replace column values with last occurance value based on another column

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