python - Pandas: Insert New column to dataframe and populate values within new column based on if then logic -


i have dataframe 2 country descriptions. match, don't.

country desc1        country desc2  1                2              uk            3    uk               4    uk           uk

i need 1.) insert column (country desc3) row values populated 2.) rule returns country desc1 if matches country desc2.

df['country desc3'] = \     df['country desc1'].mask(df['country desc1'] != df['country desc2'])  df    country desc1 country desc2 country desc3 0                                  1                       uk           nan 2            uk                      nan 3            uk            uk            uk

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