normpath.py 文件源码

def append(self, item):
        """append a normpath by a normsubpath or a pathitem"""
        if isinstance(item, normsubpath):
            # the normsubpaths list can be appended by a normsubpath only
            self.normsubpaths.append(item)
        elif isinstance(item, path.pathitem):
            # ... but we are kind and allow for regular path items as well
            # in order to make a normpath to behave more like a regular path
            if self.normsubpaths:
                context = path.context(*(self.normsubpaths[-1].atend_pt() +
                                         self.normsubpaths[-1].atbegin_pt()))
                item.updatenormpath(self, context)
            else:
                self.normsubpaths = item.createnormpath(self).normsubpaths