stmt.py 文件源码

def get_target(self, target):
        if isinstance(target, ast.Subscript) and self.context.in_for_loop:  # Check if we are doing assignment of an iteration loop.
            raise_exception = False
            if isinstance(target.value, ast.Attribute):
                list_name = "%s.%s" % (target.value.value.id, target.value.attr)
                if list_name in self.context.in_for_loop:
                    raise_exception = True

            if isinstance(target.value, ast.Name) and \
               target.value.id in self.context.in_for_loop:
                list_name = target.value.id
                raise_exception = True

            if raise_exception:
                raise StructureException("Altering list '%s' which is being iterated!" % list_name, self.stmt)

        if isinstance(target, ast.Name) and target.id in self.context.forvars:
            raise StructureException("Altering iterator '%s' which is in use!" % target.id, self.stmt)
        target = Expr.parse_variable_location(target, self.context)
        if target.location == 'storage' and self.context.is_constant:
            raise ConstancyViolationException("Cannot modify storage inside a constant function: %s" % target.annotation)
        if not target.mutable:
            raise ConstancyViolationException("Cannot modify function argument: %s" % target.annotation)
        return target