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问题描述
我不小心写了:
total_acc =+ accuracy
代替:
total_acc += accuracy
我在网上搜索，找不到任何东西.那么发生了什么，为什么Python认为我的意思是我要输入的内容?
I searched the net and could not find anything. So what happened, why does Python think I mean what I am typing?
推荐答案
这与您要像total_acc = -accuracy一样，只不过是正面的而不是负面的.不过，它基本上与total_acc = accuracy相同，因为在值之前添加+不会更改它.
This is the same as if you were to do like total_acc = -accuracy, except positive instead of negative. It basically is the same as total_acc = accuracy though, as adding a + before a value does not change it.
这称为一元运算符，因为只有一个参数(例如:+a)而不是两个参数(例如:a+b).
This is called an unary operator as there is only one argument (ex: +a) instead of two (ex: a+b).
此链接对其进行了详细说明.
This link explains it a little more.
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