code: def convert_to_int(value, from_base):
          
          if from_base < 2:
              raise BasesValueError(
                 from_base,
                 "from_base",
                 "must be greater than 2"
              )
  
          if any(x < 0 or x >= from_base for x in value):
              raise BasesValueError(
                 value,
                 "value",
                 "elements must be at least 0 and less than %s" % from_base
              )
          return reduce(lambda x, y: x * from_base + y, value, 0)
docs: Convert value to an int.
  
          :param value: the value to convert
          :type value: sequence of int
          :param int from_base: base of value
          :returns: the conversion result
          :rtype: int
          :raises ConvertError: if from_base is less than 2
          :raises ConvertError: if elements in value outside bounds
  
          Preconditions:
            * all integers in value must be at least 0
            * all integers in value must be less than from_base
            * from_base must be at least 2
  
          Complexity: O(len(value))