需要帮助以了解python字典

Question

Could someone explain me why the output of this code is same value using a dictionary? I thought if I add a key to the corresponding variable dictionary I can manipulate it's values.

Thanks for the help.

>>> sample = {}
>>> listDict1 = {}

>>> listDict1['a'] = 'b'
>>> listDict1['c'] = 'd'

>>> sample["item1"] = listDict1

>>> listDict1['a'] = 'x'
>>> listDict1['c'] = 'y'

>>> sample["item2"] = listDict1

>>> sample
{'item2': {'a': 'x', 'c': 'y'}, 'item1': {'a': 'x', 'c': 'y'}}

I expected:

{'item2': {'a': 'x', 'c': 'y'}, 'item1': {'a': 'b', 'c': 'd'}}

Answer 1

using the above suggestion comments, i edit the code and works perfectly fine. Thanks.

sample = {}

listDict1 = {}


listDict1['a'] = 'b'
listDict1['c'] = 'd'

sample["item1"] = dict(listDict1)

listDict1['a'] = 'x'
listDict1['c'] = 'y'

sample["item2"] = dict(listDict1)


print id(sample["item1"])
print id(sample["item2"] )
print sample

OUTPUT:
40012512
40012656
{'item2': {'a': 'x', 'c': 'y'}, 'item1': {'a': 'b', 'c': 'd'}}