from multiprocessing import Process, Manager

def update_me(dict_obj, key):
    dict_obj[key] = 'a value'

threads = []
manager = Manager()
my_dict = manager.dict()

for i in range(10):
    p = Process(target=update_me, args=(my_dict, i))
    threads.append(p)
for thread in threads:
    thread.deamon = True
    thread.start()
for thread in threads:
    thread.join()

print('Processes ended')

print(type(my_dict))

print(my_dict)

for key in my_dict:
    print(key)

'''
$ python3 test.py 
Processes ended
<class 'multiprocessing.managers.DictProxy'>
{0: 'a value', 1: 'a value', 2: 'a value', 3: 'a value', 4: 'a value', 5: 'a value', 6: 'a value', 7: 'a value', 8: 'a value', 9: 'a value'}
a value
a value
a value
a value
a value
a value
a value
a value
a value
a value
Traceback (most recent call last):
  File "test.py", line 25, in <module>
    for key in my_dict:
  File "<string>", line 2, in __getitem__
  File "/usr/lib/python3.6/multiprocessing/managers.py", line 772, in _callmethod
    raise convert_to_error(kind, result)
KeyError: 10
'''