如何在 __init__ 中设置 python 属性 [英] How to set a python property in __init__

问题描述

我有一个类的属性，我希望将其转换为 property，但该属性是在 __init__ 中设置的.不知道这应该怎么做.无需在 __init__ 中设置属性，这很容易并且运行良好

I have a class with an attribute I wish to turn into a property, but this attribute is set within __init__. Not sure how this should be done. Without setting the property in __init__ this is easy and works well

import datetime

class STransaction(object):
    """A statement transaction"""
    def __init__(self):
        self._date = None

    @property
    def date(self):
        return self._date

    @date.setter
    def date(self, value):
        d = datetime.datetime.strptime(value, "%d-%b-%y")
        self._date = d

st = STransaction()
st.date = "20-Jan-10"

但是一旦需要在 __init__ 中进行初始化，它就会变得更加复杂，我不确定正确的操作过程.

But once initialization needs to occur in __init__ it gets more complicated and I am not sure of the correct course of action.

class STransaction(object):
    """A statement transaction"""
    def __init__(self, date):
        self._date = None

令我感到奇怪的是，以下内容似乎有效，但闻起来很糟糕.

Strangely to me, the following seems to work but smells very bad.

class STransaction(object):
    """A statement transaction"""
    def __init__(self, date):
        self._date = None
        self.date = date

    @property
    def date(self):
        return self._date

    @date.setter
    def date(self, value):
        d = datetime.datetime.strptime(value, "%d-%b-%y")
        self._date = d

在 __init__ 中设置属性的正确方法是什么?

What is the correct way to go about setting properties in __init__?

谢谢，亚伦.

推荐答案

我看不出您的代码有任何实际问题.在 __init__ 中，类已完全创建，因此属性可访问.

I do not see any real problem with your code. In __init__, the class is fully created and thus the properties accessible.

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