python - 在 Python 中检索值的字典的嵌套字典列表

Question

嵌套的困惑看起来像这样:

{ Users : [
    {'Username': 'abc', 'Attributes' : [{'a':'x'},{'b':x'}]},
    {'Username' : 'def' ...}
]}

我尝试过:

for k,v in users.items() :
    for i in v :
        for k,v in i :
            if k == 'Username' :
                print(v)

错误是

"errorMessage": "too many values to unpack (expected 2)"

尝试过:

for v in users['Users'] :
    for i in v :
       for k in v[i] :
           print(k)

错误信息:

"errorMessage": "not enough values to unpack (expected 2, got 1)"

我需要检索“用户名”的值并将它们放入一个简单的列表中。有人可以指出我在这里没有得到什么吗？

Answer 1

你是如此接近:

usernames = []
for k,v in users.items():
    for i in v:
        for k,v in i.items():
            #       ^^^^^^^^ you were just missing one more `.items()` call
            if k == 'Username':
                usernames.append(v)