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def make_rel_path(from_path, to_path):
    from_path = Path(from_path)
    to_path = Path(to_path)
    rel_url = to_path.name
    for parent2 in to_path.parents:
        up = 0
        for parent1 in from_path.parents:
            up += 1
            if parent1 == parent2:
                common = parent1

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Resources:
  # the hello-world function from the sample project
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.8
      Events:
        HelloWorld:

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Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.8
      # add an environment variable so the code can get the table name
      Environment:
        Variables:

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import os
import json
import boto3

def lambda_handler(event, context):
  # environment variables are native, so use a language-specific
  # method to access them, not the lambda context
  table = os.environ['TABLE_NAME']

  # use the AWS SDK to scan the table by name

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Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.8
      Environment:
        Variables:
          TABLE_NAME: !Ref MyTable

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Parameters:
  DeploymentStage:
  Type: String
  Default: staging
  AllowedValues:
    - staging
    - production
  Description: Staging or production deployment. Default is staging.

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Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello_world/
      Handler: app.lambda_handler
      Runtime: python3.8
      Environment:
        Variables:
          # add a variable with the value of the DeploymentStage template parameter

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Mappings:
  EnvironmentVariables:
    # mapping keys are the allowed values for DeploymentStage
    staging:
      # mapping value is multi-value where key is the environment variable
      PROD: false
      API_URL: {staging api endpoint url}
    production:
      PROD: true
      API_URL: {production api endpoint url}

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Parameters:
  DeploymentStage:
    Type: String
    Default: staging
    AllowedValues:
      - staging
      - production
    Description: Staging or Production deployment. Default is staging.
   
  # New parameter for the API Gateway stage name

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Resources:
  Api:
    Type: AWS::Serverless::Api
    Properties:
    StageName: !Ref ApiStageName # use our parameter