title: SAM Lambda: [ERROR] Runtime.ImportModuleError: Unable to import module 'index': No module named 'pg8000'
body: <p>I've deployed a lambda (python3.7) which uses pg8000 </p>
  
  <pre><code>import pg8000
  ..
  def get_connection():
      """
          Method to establish the connection.
      """
      try:
          print ("Connecting to database")
          # Create a low-level client with the service name for rds
          client = boto3.client("rds")
          # Read the environment variables to get DB EndPoint
          DBEndPoint = os.environ.get("DBEndPoint")
          # Read the environment variables to get the Database name
          DatabaseName = os.environ.get("DatabaseName")
          # Read the environment variables to get the Database username which has access to database.
          DBUserName = os.environ.get("DBUserName")
          # Generates an auth token used to connect to a db with IAM credentials.
          password = client.generate_db_auth_token(
              DBHostname=DBEndPoint, Port=5432, DBUsername=DBUserName
          )
          # Establishes the connection with the server using the token generated as password
          conn = pg8000.connect(
              host=DBEndPoint,
              user=DBUserName,
              database=DatabaseName,
              password=password,
              ssl={"sslmode": "verify-full", "sslrootcert": "rds-ca-2015-root.pem"},
          )
          print("Succesful connection!")
          return conn
      except Exception as e:
          print ("While connecting failed due to :{0}".format(str(e)))
          return None
  ...
  </code></pre>
  
  <p>I have a requirements.txt which contains:</p>
  
  <pre><code>pg8000==1.13.2
  boto3==1.9.67
  </code></pre>
  
  <p>I'm performing a sam build, sam package and sam deploy. Does sam build not handle the download of dependencies like pg8000?</p>
  
  <p>Exact commands:</p>
  
  <pre><code>sam build
  sam package --template-file ./template.yml --output-template-file output.yml --s3-bucket xxx-bucket
  sam deploy --template-file ./output.yml --stack-name demo --capabilities CAPABILITY_IAM
  </code></pre>
  
  <p>Error after triggering lambda:</p>
  
  <pre><code>[ERROR] Runtime.ImportModuleError: Unable to import module 'index': No module named 'pg8000'
  </code></pre>