Python等效于C#6中引入的空条件运算符 [英] Python's equivalent to null-conditional operator introduced in C# 6

问题描述

Python中是否有等效于C#的空条件运算符?

Is there an equivalent in Python to C# null-conditional operator?

System.Text.StringBuilder sb = null;
string s = sb?.ToString(); // No error

推荐答案

怎么样:

s = sb and sb.ToString()

如果sb为Falsy，则短路布尔值停止，否则返回下一个表达式.

The short circuited Boolean stops if sb is Falsy, else returns the next expression.

顺便说一句，如果获取None不重要...

Btw, if getting None is important...

sb = ""

#we wont proceed to sb.toString, but the OR will return None here...
s = (sb or None) and sb.toString()

print s, type(s)

输出:

None <type 'NoneType'>

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