Let's sort our DataFrame according to the city area:
city_frame = city_frame.sort_values(by="area", ascending=False)
print(city_frame)
country area population
London England 1572.00 8615246
Rome Italy 1285.00 2874038
Berlin Germany 891.85 3562166
Hamburg Germany 755.00 1760433
Madrid Spain 605.77 3165235
Budapest Hungary 525.20 1754000
Warsaw Poland 517.00 1740119
Vienna Austria 414.60 1805681
Munich Germany 310.40 1493900
Bucharest Romania 228.00 1803425
Milan Italy 181.80 1350680
Paris France 105.40 2273305
Barcelona Spain 101.90 1602386