如何将此值添加到先前是字典的列表中?

Question

不好意思，我不知道怎么解释。这里我要做的是对作为参数的字典进行迭代。然后返回一个新字典，它从键中获取列表值，并在包含该值的PREVIOUS字典中创建一个键列表。我一时想不明白。

谢谢你的帮助!

def groups_per_user(group_dictionary):
user_groups = {}

# Go through group_dictionary
for group, users in group_dictionary.items():
# Now go through the users in the group
for user in users:
# Now add the group to the the list of
# groups for this user, creating the entry
# in the dictionary if necessary
user_groups[user] = [group for user in group_dictionary]
return(user_groups)
print(groups_per_user({"local": ["admin", "userA"],
"public":  ["admin", "userB"],
"administrator": ["admin"] }))
# Expected output: {'admin':['local','public','administrator'], 'userA':['local', 'userB':['public']}

Answer 1

如果您想要查看每个用户具有哪些组的权限/访问权限。添加到您提供的代码中，只需要添加几行额外的代码。

def groups_per_user(group_dictionary):
user_groups = {}
for group, users in group_dictionary.items():
for user in users:
if user in user_groups:
user_groups[user].append(group)
else:
user_groups[user] = [group]
return user_groups
groups_per_user(groups)
>> {'admin': ['local', 'public', 'administrator'],
'userA': ['local'],
'userB': ['public']}

一旦用户在当前循环中，检查他们是否在user_groups中，如果是，则意味着列表已经存在，我们可以附加group，否则我们将user的键设置为当前group的单个项目列表。