checker.py 文件源码

def handleDoctests(self, node):
        try:
            (docstring, node_lineno) = self.getDocstring(node.body[0])
            examples = docstring and self._getDoctestExamples(docstring)
        except (ValueError, IndexError):
            # e.g. line 6 of the docstring for <string> has inconsistent
            # leading whitespace: ...
            return
        if not examples:
            return

        # Place doctest in module scope
        saved_stack = self.scopeStack
        self.scopeStack = [self.scopeStack[0]]
        node_offset = self.offset or (0, 0)
        self.pushScope(DoctestScope)
        underscore_in_builtins = '_' in self.builtIns
        if not underscore_in_builtins:
            self.builtIns.add('_')
        for example in examples:
            try:
                tree = compile(example.source, "<doctest>", "exec", ast.PyCF_ONLY_AST)
            except SyntaxError:
                e = sys.exc_info()[1]
                if PYPY:
                    e.offset += 1
                position = (node_lineno + example.lineno + e.lineno,
                            example.indent + 4 + (e.offset or 0))
                self.report(messages.DoctestSyntaxError, node, position)
            else:
                self.offset = (node_offset[0] + node_lineno + example.lineno,
                               node_offset[1] + example.indent + 4)
                self.handleChildren(tree)
                self.offset = node_offset
        if not underscore_in_builtins:
            self.builtIns.remove('_')
        self.popScope()
        self.scopeStack = saved_stack