code: def expression_list_to_conjunction(expression_list):
      
      if not isinstance(expression_list, list):
          raise AssertionError(u'Expected `list`, Received {}.'.format(expression_list))
  
      if len(expression_list) == 0:
          return TrueLiteral
  
      if not isinstance(expression_list[0], Expression):
          raise AssertionError(u'Non-Expression object {} found in expression_list'
                               .format(expression_list[0]))
      if len(expression_list) == 1:
          return expression_list[0]
      else:
          return BinaryComposition(u'&&',
                                   expression_list_to_conjunction(expression_list[1:]),
                                   expression_list[0])
docs: Convert a list of expressions to an Expression that is the conjunction of all of them.