starting CountryColumnsMergerTest

src/CountryColumnsMerger.py

@@ -0,0 +1,23 @@
+import pandas as pd
+
+
+class CountryColumnsMerger:
+
+    @staticmethod
+    def mergeCountryColumnOfSrcIntoDst(src: pd.DataFrame, dst: pd.DataFrame):
+        def merge(series):
+            if pd.isnull(series['COUNTRY_dst']):
+                return series['COUNTRY_src']
+            else:
+                return series['COUNTRY_dst']
+
+        merged = pd.merge(
+            dst,
+            src,
+            how = 'left',
+            left_index = True,
+            right_index = True,
+            suffixes=('_dst', '_src'))
+        merged['COUNTRY'] = merged.apply(merge, axis = 'columns').astype('string')
+        return merged.drop(columns = ['COUNTRY_dst', 'COUNTRY_src'])
+