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Combining Rows Based on Column Value

I have a sample similar to the problem I am running into. Here, I have company name and revenue for 3 years. The revenue is given in 3 different datasets. When I concatenate the data, it looks as follows:

  company_name  2020 Revenue  2021 Revenue  2022 Revenue
0    company_1          10.0           NaN           NaN
1    company_2          20.0           NaN           NaN
2    company_3          30.0           NaN           NaN
3    company_1           NaN          20.0           NaN
4    company_2           NaN          30.0           NaN
5    company_3           NaN          40.0           NaN
6    company_1           NaN           NaN          50.0
7    company_2           NaN           NaN          60.0
8    company_3           NaN           NaN          70.0
9    company_4           NaN           NaN          80.0

What I am trying to do is have company name followed by the actual revenue columns. In a sense drop the duplicate company_name rows and put that data into the corresponding company_name. An image of my desired output:

  company_name  2020 Revenue  2021 Revenue  2022 Revenue
0    company_1            10            20            50
1    company_2            20            30            60
2    company_3            30            40            70
3    company_4             0             0            80


source https://stackoverflow.com/questions/72566608/combining-rows-based-on-column-value
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