实例的默认__str__方法 [英] Default __str__ method for an instance

问题描述

我有一个没有 str 或 repr 方法的类。而当我称呼它时：

I have a class without a str or repr method. And when I call it:

>>> from ingest.tpr import TPR
>>> t=TPR()
>>> t # that is, "repr(t)"
<ingest.tpr.TPR instance at 0x101eb8518>

此处的默认表示类似于：

The default representation here seems to be something like:

"<${path_to_class} instance at ${memory_address}>"

在哪里提供此默认实现？上面是 __ repr __ 方法还是 __ str __ 方法-我知道它称为上面的__repr __ 方法，但 __ str __ 和 __ repr __ 方法都初始化为一开始是相同的事情，还是只是简单地将另一个称为后备。换句话说，默认的 __ str __ 和 __ repr __ 在python中是什么样子？在哪里定义？

Where is this default implementation supplied? And is the above the __repr__ method or the __str__ method -- I know it calls the __repr__ method in the above, but are both the __str__ and __repr__ methods initialized to the same thing at the start, or does one simply call the other as a "fall-back". In other words, what does the default __str__ and __repr__ look like in python and where would that be defined?

推荐答案

t .__ repr __ （这是 repr （t）调用）解析为（假设没有其他上游定义） object .__ repr __ ，该对象由Python实现定义（例如，< a href = https://github.com/python/cpython/blob/master/Objects/typeobject.c#L3827 rel = nofollow noreferrer> https://github.com/python/cpython/blob/master /Objects/typeobject.c#L3827 ）

t.__repr__ (which is what repr(t) calls) resolves to (assuming no other upstream definitions) object.__repr__, which is defined by the Python implementation (for example, https://github.com/python/cpython/blob/master/Objects/typeobject.c#L3827)

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