code: def _expression_list_to_conjunction(expression_list):
      
      if not isinstance(expression_list, list):
          raise AssertionError(u'Expected list. Received {}: '
                               u'{}'.format(type(expression_list).__name__, expression_list))
      if len(expression_list) == 0:
          raise AssertionError(u'Received empty expression_list '
                               u'(function should never be called with empty list): '
                               u'{}'.format(expression_list))
      elif len(expression_list) == 1:
          return expression_list[0]
      else:
          remaining_conjunction = _expression_list_to_conjunction(expression_list[1:])
          return BinaryComposition(u'&&', expression_list[0], remaining_conjunction)
docs: Return an Expression that is the `&&` of all the expressions in the given list.