code: def has_value(key, value=None):
      '''
      Determine whether the key exists in the current salt process
      environment dictionary. Optionally compare the current value
      of the environment against the supplied value string.
  
      key
          Must be a string. Used as key for environment lookup.
  
      value:
          Optional. If key exists in the environment, compare the
          current value with this value. Return True if they are equal.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' environ.has_value foo
      '''
      if not isinstance(key, six.string_types):
          log.debug('%s: \'key\' argument is not a string type: \'%s\'', __name__, key)
          return False
      try:
          cur_val = os.environ[key]
          if value is not None:
              if cur_val == value:
                  return True
              else:
                  return False
      except KeyError:
          return False
      return Truf has_value(key, value=None):
      '''
      Determine whether the key exists in the current salt process
      environment dictionary. Optionally compare the current value
      of the environment against the supplied value string.
  
      key
          Must be a string. Used as key for environment lookup.
  
      value:
          Optional. If key exists in the environment, compare the
          current value with this value. Return True if they are equal.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' environ.has_value foo
      '''
      if not isinstance(key, six.string_types):
          log.debug('%s: \'key\' argument is not a string type: \'%s\'', __name__, key)
          return False
      try:
          cur_val = os.environ[key]
          if value is not None:
              if cur_val == value:
                  return True
              else:
                  return False
      except KeyError:
          return False
      return True
docs: Determine whether the key exists in the current salt process
      environment dictionary. Optionally compare the current value
      of the environment against the supplied value string.
  
      key
          Must be a string. Used as key for environment lookup.
  
      value:
          Optional. If key exists in the environment, compare the
          current value with this value. Return True if they are equal.
  
      CLI Example:
  
      .. code-block:: bash
  
          salt '*' environ.has_value foo