在python的嵌套字典中添加键 [英] adding keys in nested dictionary in python

问题描述

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

在氢和氦字典中添加一个is_noble_gas布尔条目.

Add an is_noble_gas boolean entry to the hydrogen and helium dictionaries.

推荐答案

您应该访问字典，并将is_noble_gas作为新关键字添加到字典中，如下所示.

You should access the dictionary and add is_noble_gas as a new key to the dictionary as follows.

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

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