Python中列表的布尔值
问题描述
将列表转换为布尔值的最佳方法是什么?我正在寻找类似的东西:
what is the best way to turn a list into bool value? I am looking for something like:
return eval_bool(my_list)
我有一个自定义容器,我在其中实现了 __nonzero__
方法,该方法应该像这样工作:
I have a custom container in which I implement the __nonzero__
method which is supposed to work like this:
if self.my_list:
return True
return False
但它足够pythonic吗?:) 无论如何,我很好奇 Python 如何解释 if
语句中列表的值,因为这段代码的工作方式不同:
But is it pythonic enough? :) Anyway, I am curious how Python interprets the value of the list in the if
statement because this code works differently:
return my_list == True
J.
解决方案
随便用:
bool(my_list)
将其评估为 Python真实性"并返回一个真正的布尔值.
Which evaluates it as Python "truthiness" and returns a real Boolean.
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