列表理解以动态填充对象的属性
List comprehension to dynamically populate attribute of object
动态填充给定属性值列表的正确方法是什么?目前它固定为 3 (0-2),但如果它基于 INSTANCE_PARAMS[i]["instances"].
会更有用
我一直在考虑列表理解,但不确定如何将其写入代码。
for i in INSTANCE_PARAMS:
output = template.add_output([
Output(
str(INSTANCE_PARAMS[i]["name"]).capitalize() + "Ips",
Description="IPs for " + str(INSTANCE_PARAMS[i]["name"]),
Value=Join(",", [
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "0"), "PrivateIp"),
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "1"), "PrivateIp"),
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "2"), "PrivateIp"),
],
),
)
],
)
INSTANCE_PARAMS = {
"masters": {
"name": "master",
"instances": 3,
"image_id": "ami-xxxxxxxxxx",
"instance_type": "t1.micro",
"security_group_id": [
"MasterSG",
"ClusterSG"
],
},
}
通过以下方式实现:
template = Template()
for i in INSTANCE_PARAMS:
# declared a new list
tag_value = []
# got the counter
for r in range(INSTANCE_PARAMS[i]["instances"]):
# added each one to the new list
tag_value.append(GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + str(r)), "PrivateIP"))
output = template.add_output([
Output(
str(INSTANCE_PARAMS[i]["name"]).capitalize() + "Ips",
Description="IPs for " + str(INSTANCE_PARAMS[i]["name"]),
# passed in the list
Value=Join(",", tag_value,
),
)
],
)
print(template.to_yaml())
动态填充给定属性值列表的正确方法是什么?目前它固定为 3 (0-2),但如果它基于 INSTANCE_PARAMS[i]["instances"].
会更有用我一直在考虑列表理解,但不确定如何将其写入代码。
for i in INSTANCE_PARAMS:
output = template.add_output([
Output(
str(INSTANCE_PARAMS[i]["name"]).capitalize() + "Ips",
Description="IPs for " + str(INSTANCE_PARAMS[i]["name"]),
Value=Join(",", [
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "0"), "PrivateIp"),
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "1"), "PrivateIp"),
GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + "2"), "PrivateIp"),
],
),
)
],
)
INSTANCE_PARAMS = {
"masters": {
"name": "master",
"instances": 3,
"image_id": "ami-xxxxxxxxxx",
"instance_type": "t1.micro",
"security_group_id": [
"MasterSG",
"ClusterSG"
],
},
}
通过以下方式实现:
template = Template()
for i in INSTANCE_PARAMS:
# declared a new list
tag_value = []
# got the counter
for r in range(INSTANCE_PARAMS[i]["instances"]):
# added each one to the new list
tag_value.append(GetAtt(ec2.Instance(INSTANCE_PARAMS[i]["name"] + str(r)), "PrivateIP"))
output = template.add_output([
Output(
str(INSTANCE_PARAMS[i]["name"]).capitalize() + "Ips",
Description="IPs for " + str(INSTANCE_PARAMS[i]["name"]),
# passed in the list
Value=Join(",", tag_value,
),
)
],
)
print(template.to_yaml())