How to make a multidimensional dictionary with grouping in Python (see example)?

Question

Python

Let me explain with an example. There is json:

{'city':'Moscow', 'manager':'Igor'},
{'city':'Kazan', 'manager':'Valera'},
{'city':'Moscow', 'manager':'Olga'},
{'city':'Kazan', 'manager':'Natalia'},
{'city':'Moscow', 'manager':'Oleg'},

How to easily and competently make such a structure?

'Moscow': ['Igor','Olga','Oleg'],
'Kazan': ['Valera','Natalia']

Answer 1

res = {}
for d in ({'city': 'Moscow', 'manager': 'Igor'},
          {'city': 'Kazan', 'manager': 'Valera'},
          {'city': 'Moscow', 'manager': 'Olga'},
          {'city': 'Kazan', 'manager': 'Natalia'},
          {'city': 'Moscow', 'manager': 'Oleg'}):
    res.setdefault(d['city'], []).append(d['manager'])
print(res)