python字典-合并两个字典,并在匹配时附加键值

我有两个字典清单。一种是嵌套的层次结构格式,另一种是简单的字典列表。我正在尝试像我们在熊猫或sql中使用的“外部连接”那样做“连接”。基本上,我试图从字典中捕获键/值,而其他字典中不存在键/值。这是我尝试过的。

字典1: 大型嵌套词典:

data = [
    {'file_name': 'abc.pdf','year':'2016','overview': {
          'student_id': '123abc','name': 'Adam Smith','courses': ['Math','Physics'],}},{'file_name': 'def.pdf','year':'2017','courses': ['Arts'],}}
]

字典2:

mapper =[{
    'year':'2016','student_id': '123abc','counselor':'Matthews','grades':'85'
}]

尝试/合并

pairs = zip(mapper,data)

尝试1

[(x,y) for x,y in pairs if x['student_id'] == y['overview']['student_id']]

>> gives result:
[({'year': '2016','counselor': 'Matthews','grades': '85'},{'file_name': 'abc.pdf','year': '2016','overview': {'student_id': '123abc','Physics']}})]

尝试2:

[(x,y in pairs if x['student_id'] == y['overview']['student_id'] & x['year'] == y['year']]
# gives errors: `TypeError: unsupported operand type(s) for &: 'str' and 'str'`

尝试获得此结果:如果两个字典中的year和student_id匹配,则给出此结果。从字典2中开始:如果year和student_id匹配,我将尝试匹配,然后填充辅导员,“将”评分为字典1。如果不匹配,则给定字典元素。

new_data = [
    {'file_name': 'abc.pdf','grades':'85'
           }},}}
]
sxlyya 回答:python字典-合并两个字典,并在匹配时附加键值

在这种情况下,我认为zip将不是一个好的选择。我将数据的['overview']字典与mapper字典合并:

for idx,i in enumerate(data):
    for j in mapper:
        if i['overview']['student_id'] in j['student_id'] and i['year'] == j['year']:
            data[idx]['overview'] = {**i['overview'],**j}
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