countries = {
    "Israel" : "Jerusalem",
    "France" : "Paris",
    "UK" : "London"
}

countries["Finland"] = "Helsinki"

print(countries)

cities = {}

for land,city in countries.items():
    cities[city] = land

print(cities)

crazy_countries = {
    "Israel" : "Jerusalem",
    "France" : "Paris",
    "UK" : "London",
    "Texas" : "Paris",
    "Ohio" : "Jerusalem"
}

{ "Paris" : ["France", "Texas"]}

crazy_cities = {}
for land,city in crazy_countries.items():
    if city not in crazy_cities:
        crazy_cities[city] = [ land ]
    else:
        crazy_cities[city].append(land)
        

print(crazy_cities)

_ = 2

"\\."

print('\\.')

print('\\\\.')

print(r'\\.')