将嵌套的字典列表转换为平面的字典列表

Question

How do I convert this dictionary structure

[
    { 'city': 'Fake City', 'streets': {'Fake Street', 'Fake Way'}},
    { 'city': 'Ocean City', 'streets': {'Ocean Street', 'Ocean Way'}},
    { 'city': 'Forest City', 'streets': {'Forest Street', 'Forest Way'}},
]

into this one?

[
    { 'city': 'Fake City', 'street': 'Fake Street'},
    { 'city': 'Fake City', 'street': 'Fake Way'},
    { 'city': 'Ocean City', 'street': 'Ocean Street'},
    { 'city': 'Ocean City', 'street': 'Ocean Way'},
    { 'city': 'Forest City', 'street': 'Forest Street'},
    { 'city': 'Forest City', 'street': 'Forest Way'}
]

Sorry for the generic title. Perhaps I'm just missing the correct term.

I could try to loop of the items. A built in function or library for that would be nice.

Answer 1

iterate all the items in street and combine with city

a = [
        { 'city': 'Fake City', 'streets': {'Fake Street', 'Fake Way'}},
        { 'city': 'Ocean City', 'streets': {'Ocean Street', 'Ocean Way'}},
        { 'city': 'Forest City', 'streets': {'Forest Street', 'Forest Way'}},
    ]

res = []
for item in a:
    for st in item["streets"]:
        res.append({"city": item["city"], "streets": st})

res


[{'city': 'Fake City', 'streets': 'Fake Street'},
 {'city': 'Fake City', 'streets': 'Fake Way'},
 {'city': 'Ocean City', 'streets': 'Ocean Street'},
 {'city': 'Ocean City', 'streets': 'Ocean Way'},
 {'city': 'Forest City', 'streets': 'Forest Way'},
 {'city': 'Forest City', 'streets': 'Forest Street'}]