在python中的嵌套字典中添加键

在氢气和氦气字典中添加一个

is\u noble\u gas

boolean条目

elements = {'hydrogen': {'number': 1, 'weight': 1.00794, 'symbol': 'H'}, 
            'helium': {'number': 2, 'weight': 4.002602, 'symbol': 'He'}}

{'Heime'：{'symbol'：'He'，'number'：2，'weight'：4.002602，'is_noble_gas'：True}，{'symbol'：'H'，'number'：1，'weight'：1.00794，'is_noble_gas'：False}

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您应该访问字典并添加

is\u noble\u gas

作为字典的新键，如下所示

elements = {'hydrogen': {'number': 1, 'weight': 1.00794, 'symbol': 'H'}, 'helium': {'number': 2, 'weight': 4.002602, 'symbol': 'He'}}
noble_dict = { "hydrogen": False, "helium": True }
for noble in noble_dict:
    elements[ noble ][ "is_noble_gas" ] = noble_dict[ noble ]

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给我们看看你的代码。查看如何使元素['hydrogen']['is_noble_gas']=False

>>> elements['hydrogen']['is_noble_gas'] = False
>>> elements['helium']['is_noble_gas'] = True

elements['hydrogen']['is_noble_gas'] = False
elements['hydrogen']['is_noble_gas'] = True