code: def env_unset(context):
      
      unset = context['env'].get('unset', None)
  
      exists = False
      if unset:
          logger.debug("started")
  
          for env_var_name in unset:
              logger.debug(f"unsetting ${env_var_name}")
              try:
                  del os.environ[env_var_name]
              except KeyError:
                  # If user is trying to get rid of the $ENV, if it doesn't
                  # exist, no real point in throwing up an error that the thing
                  # you're trying to be rid off isn't there anyway.
                  logger.debug(
                      f"${env_var_name} doesn't exist anyway. As you were.")
  
          logger.info(f"unset {len(unset)} $ENVs.")
          exists = True
  
          logger.debug("done")
      return exists
docs: Unset $ENVs.
  
      Context is a dictionary or dictionary-like. context is mandatory.
  
      context['env']['unset'] must exist. It's a list.
      List items are the names of the $ENV values to unset.
  
      For example, say input context is:
          key1: value1
          key2: value2
          key3: value3
          env:
              unset:
                  MYVAR1
                  MYVAR2
  
      This will result in the following $ENVs being unset:
      $MYVAR1
      $MYVAR2