def is_anyone_in(collection, city):
for name, ct in collection.items():
if ct == city:
print('В городе ' + city + ' живёт ' + name + '.')
friends = {
'Серёга': 'Омск',
'Соня': 'Москва',
'zxcv': 'Хабаровск',
'Дима': 'Челябинск',
'Алина': 'Хабаровск',
'Егор': 'Пермь'
}
is_anyone_in(friends, 'Хабаровск')
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