Update the solution

Author: ch-garcia

30-days-pandas/0595-big-countries.py

@@ -55,5 +55,4 @@
 import pandas as pd
 
 def big_countries(world: pd.DataFrame) -> pd.DataFrame:
-    df = world[(world["area"] >= 3000000) | (world["population"] >= 25000000)]
-    return df[["name","population","area"]]
+    return world[(world['area'] >= 3000000) | (world['population'] >= 25000000)][['name', 'population', 'area']]