None 在 Python 链式属性访问中传播

Question

在Python中是否有空传播运算符（"null-aware member access"运算符）所以我可以写类似

的东西

var = object?.children?.grandchildren?.property

如 C#、VB.NET 和 TypeScript，而不是

var = None if not myobject\
              or not myobject.children\
              or not myobject.children.grandchildren\
    else myobject.children.grandchildren.property

Answer 1

没有。有一个 PEP proposing the addition of such operators 但尚未（尚未）被接受。

特别是 PEP 505 中提出的运算符之一是

The "None-aware attribute access" operator ?. ("maybe dot") evaluates the complete expression if the left hand side evaluates to a value that is not None