用python安全转换 [英] Safe casting in python

问题描述

如何在python中安全地投射

How to do safe cast in python

在c＃中，我可以通过关键字来安全地投射，例如：

In c# I can safe cast by keyword as, e.g.:

string word="15";
var x=word as int32// here I get 15

string word="fifteen";
var x=word as int32// here I get null

具有类似于python的东西

Has python something similar to this?

推荐答案

不认为，但是您可以实现自己的：

Think not, but you may implement your own:

def safe_cast(val, to_type, default=None):
    try:
        return to_type(val)
    except (ValueError, TypeError):
        return default

safe_cast('tst', int) # will return None
safe_cast('tst', int, 0) # will return 0

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