hunk.code_window:     SENDGRID_API_KEY={your-sendgrid-api-key}.
       """
       mail = Mail()
       mail.from_email = Email(os.environ.get('SENDGRID_MAIL_FROM'))
       mail.subject = subject
       # Add the recipient list of to emails.
       personalization = Personalization()
  
hunk.labels: keep keep keep replace keep keep keep keep
hunk.after_edit:     from_email = kwargs.get('from_email') or os.environ.get('SENDGRID_MAIL_FROM')
       from_name = kwargs.get('from_name') or os.environ.get('SENDGRID_MAIL_SENDER')
       mail.from_email = Email(from_email, from_name)
  
hunk.file_path: airflow/contrib/utils/sendgrid.py
hunk.type: replace
file: # -*- coding: utf-8 -*-
  #
  # Licensed to the Apache Software Foundation (ASF) under one
  # or more contributor license agreements.  See the NOTICE file
  # distributed with this work for additional information
  # regarding copyright ownership.  The ASF licenses this file
  # to you under the Apache License, Version 2.0 (the
  # "License"); you may not use this file except in compliance
  # with the License.  You may obtain a copy of the License at
  # 
  #   http://www.apache.org/licenses/LICENSE-2.0
  # 
  # Unless required by applicable law or agreed to in writing,
  # software distributed under the License is distributed on an
  # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  # KIND, either express or implied.  See the License for the
  # specific language governing permissions and limitations
  # under the License.
  
  
  from time import sleep
  
  from airflow.exceptions import AirflowException, AirflowSensorTimeout, \
      AirflowSkipException
  from airflow.models import BaseOperator
  from airflow.utils import timezone
  from airflow.utils.decorators import apply_defaults
  
  
  class BaseSensorOperator(BaseOperator):
      """
      Sensor operators are derived from this class an inherit these attributes.
  
      Sensor operators keep executing at a time interval and succeed when
          a criteria is met and fail if and when they time out.
  
      :param soft_fail: Set to true to mark the task as SKIPPED on failure
      :type soft_fail: bool
      :param poke_interval: Time in seconds that the job should wait in
          between each tries
      :type poke_interval: int
      :param timeout: Time, in seconds before the task times out and fails.
      :type timeout: int
      """
      ui_color = '#e6f1f2'
  
      @apply_defaults
      def __init__(self,
                   poke_interval=60,
                   timeout=60 * 60 * 24 * 7,
                   soft_fail=False,
                   *args,
                   **kwargs):
          super(BaseSensorOperator, self).__init__(*args, **kwargs)
          self.poke_interval = poke_interval
          self.soft_fail = soft_fail
          self.timeout = timeout
  
      def poke(self, context):
          """
          Function that the sensors defined while deriving this class should
          override.
          """
          raise AirflowException('Override me.')
  
      def execute(self, context):
          started_at = timezone.utcnow()
          while not self.poke(context):
              if (timezone.utcnow() - started_at).total_seconds() > self.timeout:
                  if self.soft_fail:
                      raise AirflowSkipException('Snap. Time is OUT.')
                  else:
                      raise AirflowSensorTimeout('Snap. Time is OUT.')
              sleep(self.poke_interval)
          self.log.info("Success criteria met. Exiting.")
  