我正在尝试使用 Terraform 部署 Cloudfront 发行版，但在指定 origin_id 时出现错误
Cloudfront 通过 Route53 查找指向负载均衡器。
resource "aws_cloudfront_distribution" "my-app" {
origin {
custom_origin_config {
http_port = 443
https_port = 443
origin_protocol_policy = "https-only"
origin_ssl_protocols = ["TLSv1.2"]
}
domain_name = "${var.domain_name}"
origin_id = "Custom-${var.domain_name}"
}
...
default_cache_behavior {
allowed_methods = ["GET", "HEAD", "OPTIONS", "PATCH", "POST", "PUT", "DELETE"]
cached_methods = ["GET", "HEAD"]
target_origin_id = "${local.origin_id}"
...
其中var.domain_name是 route53 记录，local.origin_id是唯一 ID。
执行 terraform apply 时，出现此错误：
aws_cloudfront_distribution.my-app: error creating CloudFront Distribution: NoSuchOrigin: One or more …
我正在尝试在我的 python 代码上运行 flake8 linter，但我遇到了一些问题。
运行 pip install 给了我这个响应：
~ pip install flake8
Requirement already satisfied: flake8 in ./Library/Python/2.7/lib/python/site-packages
Requirement already satisfied: enum34; python_version < "3.4" in ./Library/Python/2.7/lib/python/site-packages (from flake8)
Requirement already satisfied: configparser; python_version < "3.2" in ./Library/Python/2.7/lib/python/site-packages (from flake8)
Requirement already satisfied: mccabe<0.7.0,>=0.6.0 in ./Library/Python/2.7/lib/python/site-packages (from flake8)
Requirement already satisfied: pycodestyle<2.4.0,>=2.0.0 in ./Library/Python/2.7/lib/python/site-packages (from flake8)
Requirement already satisfied: pyflakes<1.6.0,>=1.5.0 in ./Library/Python/2.7/lib/python/site-packages (from flake8)
但是当我尝试运行它时，我收到了这个错误。
~ flake8 --version
zsh: command not found: flake8
如果这有什么不同，我也在使用 mac。
请任何人都可以帮忙。
我正在尝试使用自然数创建一些函数.
import Prelude
data Nat = Zero | Succ Nat
add:: Nat -> Nat -> Nat
add Zero n = n
add (Succ m) n = Succ (add m n)
mult :: Nat -> Nat -> Nat
mult x Zero = Zero
mult x (Succ y) = add x (mult x y)
然后当我跑
mult 3 5
我收到此错误:
<interactive>:38:6: error:
• No instance for (Num Nat) arising from the literal ‘3’
• In the first argument of ‘mult’, namely ‘3’
In …