在字典中更新字典中的值

您可以只嵌套循环:

for contact_dict in list_of_dicts:
    for phone_dict in contact_dict['phoneNumbers']:
        phone_dict['phone'] = phone_dict['phone'].replace('-', '')

这将改变现有的值。

或者,您可以创建一个结构的全新副本,并进行以下更改:

[dict(contact, phoneNumbers=[
    dict(phone_dict, phone=phone_dict['phone'].replace('-', '')) 
    for phone_dict in contact['phoneNumbers']])
 for contact in list_of_dicts]

这将创建一个半浅副本;只有 phoneNumbers 键被显式复制,但任何其他可变值都只被新字典引用。

演示:

>>> list_of_dicts = [{'name': 'Rob', 'phoneNumbers': [{'phone': '123-3214', 'type': 'home'}, {'phone': '456-3216', 'type': 'work'}]}]
>>> [dict(contact, phoneNumbers=[
...     dict(phone_dict, phone=phone_dict['phone'].replace('-', ''))
...     for phone_dict in contact['phoneNumbers']])
...  for contact in list_of_dicts]
[{'phoneNumbers': [{'phone': '1233214', 'type': 'home'}, {'phone': '4563216', 'type': 'work'}], 'name': 'Rob'}]
>>> for contact_dict in list_of_dicts:
...     for phone_dict in contact_dict['phoneNumbers']:
...         phone_dict['phone'] = phone_dict['phone'].replace('-', '')
...
>>> list_of_dicts
[{'phoneNumbers': [{'phone': '1233214', 'type': 'home'}, {'phone': '4563216', 'type': 'work'}], 'name': 'Rob'}]

只是 str.replace 这个 -

d ={'name': "Rob", 'phoneNumbers': [{'phone': '123-3214', 'type': 'home'}, {'phone': '456-3216', 'type': 'work'}]}

for dct in d["phoneNumbers"]:
    dct['phone'] = dct['phone'].replace("-","",1)

这给了你:

{'phoneNumbers': [{'phone': '1233214', 'type': 'home'}, {'phone': '4563216', 'type': 'work'}], 'name': 'Rob'}