diction={365:1}
def a():
x=diction
x.update({365:5})
def b():
x=diction
print(x[365])
a()
b() # выводит 5
print(diction[365]) # тоже выводит 5
>>> diction={365:1}
>>> print(id(diction))
4478940144
>>> def a():
... x=diction
... x.update({365:5})
... print('in a: ', id(x))
...
>>> def b():
... x=diction
... print(x[365])
... print('in b: ', id(x))
...
>>> a()
in a: 4478940144
>>> b()
5
in b: 4478940144
>>> print(id(diction))
4478940144