[英]How to get values from list of dictionary in python?
我试图从特定元素和 append 中获取值作为单个列表。
输入:
X = [
{
"Version": "2012-10-17",
"Statement": [
{
"Action": [
"iam:CreateInstanceProfile",
"iam:DeleteInstanceProfile",
"iam:GetRole",
"iam:GetInstanceProfile",
"iam:GetPolicy",
"iam:ListGroupPolicies",
"iam:RemoveRoleFromInstanceProfile",
"iam:CreateRole",
"iam:DeleteRole",
"iam:PutRolePolicy",
"iam:ListInstanceProfiles",
"iam:GetGroup",
"iam:AddRoleToInstanceProfile",
"iam:PassRole",
"iam:GetUserPolicy",
"iam:DeleteRolePolicy",
"iam:UpdateRole",
"iam:GetGroupPolicy",
"iam:GetUser",
"iam:ListRolePolicies",
"iam:GetRolePolicy",
],
"Resource": [
"arn:aws:iam::*:policy/*",
"arn:aws:iam::*:instance-profile/*",
"arn:aws:iam::*:user/*",
"arn:aws:iam::*:role/*",
"arn:aws:iam::*:group/*",
],
"Effect": "Allow",
"Sid": "VisualEditor0",
},
{
"Action": ["iam:ListPolicies", "iam:ListRoles", "iam:ListGroups"],
"Resource": "*",
"Effect": "Allow",
"Sid": "VisualEditor1",
},
],
}
]
预期 Output:
Y = [
"iam:CreateInstanceProfile",
"iam:DeleteInstanceProfile",
"iam:GetRole",
"iam:GetInstanceProfile",
"iam:GetPolicy",
"iam:ListGroupPolicies",
"iam:RemoveRoleFromInstanceProfile",
"iam:CreateRole",
"iam:DeleteRole",
"iam:PutRolePolicy",
"iam:ListInstanceProfiles",
"iam:GetGroup",
"iam:AddRoleToInstanceProfile",
"iam:PassRole",
"iam:GetUserPolicy",
"iam:DeleteRolePolicy",
"iam:UpdateRole",
"iam:GetGroupPolicy",
"iam:GetUser",
"iam:ListRolePolicies",
"iam:GetRolePolicy",
"iam:ListPolicies",
"iam:ListRoles",
"iam:ListGroups",
]
在这里,我试图获取所有“操作”的值并将它们存储为单个列表。 我怎样才能做到这一点?
提前致谢。
尝试:
Y = [j for i in [i['Action'] for i in X[0]['Statement']] for j in i]
现在您可以通过以下方式打印它:
print(Y)
请注意,在命名变量时,建议不要在 python 中使用小写字母。
如果您不喜欢 Ultra-One-Liners,请尝试:
Y = []
for i in [i['Action'] for i in X[0]['Statement']]:
Y.append(j for j in i)
如果您从不喜欢 One-Liners:
Y = []
for i in X[0]['Statement']:
for j in i['Action']:
Y.append(j)
单线解释:
i
,这是您X
中的所有Action
。j
,它是i
中的每个元素。这里:
X = [
{
"Version": "2012-10-17",
"Statement": [
{
"Action": [
"iam:CreateInstanceProfile",
"iam:DeleteInstanceProfile",
"iam:GetRole",
"iam:GetInstanceProfile",
"iam:GetPolicy",
"iam:ListGroupPolicies",
"iam:RemoveRoleFromInstanceProfile",
"iam:CreateRole",
"iam:DeleteRole",
"iam:PutRolePolicy",
"iam:ListInstanceProfiles",
"iam:GetGroup",
"iam:AddRoleToInstanceProfile",
"iam:PassRole",
"iam:GetUserPolicy",
"iam:DeleteRolePolicy",
"iam:UpdateRole",
"iam:GetGroupPolicy",
"iam:GetUser",
"iam:ListRolePolicies",
"iam:GetRolePolicy",
],
"Resource": [
"arn:aws:iam::*:policy/*",
"arn:aws:iam::*:instance-profile/*",
"arn:aws:iam::*:user/*",
"arn:aws:iam::*:role/*",
"arn:aws:iam::*:group/*",
],
"Effect": "Allow",
"Sid": "VisualEditor0",
},
{
"Action": ["iam:ListPolicies", "iam:ListRoles", "iam:ListGroups"],
"Resource": "*",
"Effect": "Allow",
"Sid": "VisualEditor1",
},
],
}
]
一个简单、整洁的生成器 function:
def get_all_actions(documents):
for doc in documents:
for stmt in doc.get("Statement", []):
yield from stmt.get("Action", [])
使用您的输入:
>>> print(list(get_all_actions(X)))
['iam:CreateInstanceProfile', 'iam:DeleteInstanceProfile', 'iam:GetRole', 'iam:GetInstanceProfile', 'iam:GetPolicy', 'iam:ListGroupPolicies', 'iam:RemoveRoleFromInstanceProfile', 'iam:CreateRole', 'iam:DeleteRole', 'iam:PutRolePolicy', 'iam:ListInstanceProfiles', 'iam:GetGroup', 'iam:AddRoleToInstanceProfile', 'iam:PassRole', 'iam:GetUserPolicy', 'iam:DeleteRolePolicy', 'iam:UpdateRole', 'iam:GetGroupPolicy', 'iam:GetUser', 'iam:ListRolePolicies', 'iam:GetRolePolicy', 'iam:ListPolicies', 'iam:ListRoles', 'iam:ListGroups']
>>>
Y=X[0]['Statement'][0]['Action']
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