删除嵌套字典的键值对

Question

我得到以下错误:

RuntimeError: dictionary changed size during iteration. 

我有以下嵌套字典:

devices = {
'devices': [
{
'id': 'XX',
'is_active': True,
'is_private_session': False,
'is_restricted': False,
'name': 'XX',
'type': 'Computer',
'volume_percent': 100
},
{
'id': 'XX',
'is_active': False,
'is_private_session': False,
'is_restricted': False,
'name': 'XX',
'type': 'Speaker',
'volume_percent': 62
}
]
}

我试图删除一些嵌套的键+值。这就是我正在尝试的:

del_key_list = ['is_private_session', 'is_restricted', 'type', 'volume_percent']
for dictionary in devices['devices']:
for key in dictionary:
if key in del_key_list:
del dictionary[key]

我是否必须使用过滤器或反向列表(list_of_key_i_want_to_save)?

Answer 1

您需要遍历键的副本，以避免在迭代期间更改字典的例外:

for dictionary in devices['devices']:
for key in list(dictionary.keys()):  # note a list() here
if key in del_key_list:
del dictionary[key]