问题描述
例如，
python
>> x = 1
>> x
1
我很想知道 x 正在返回1.我问，因为我看到调用 print x 和简单地 x 。
I'm curious about what method/function on x is returning 1. I'm asking because I'm seeing differences between calling print x and simply x.
同样，有没有办法指定所谓的内容？ IPython中是否存在此配置？
Similary, is there a way to specify what is called? Does this configuration exist in IPython?
推荐答案
当您在，它调用对象的方法。相比之下， print 使用对象的方法。示例：
When you inspect an object in that manner in a REPL, it invokes the object's __repr__ method. In comparison, print uses the object's __str__ method. Example:
>>> class Widget:
... def __repr__(self):
... return "repr of a Widget"
... def __str__(self):
... return "str of a Widget"
...
>>> x = Widget()
>>> x
repr of a Widget
>>> print(x)
str of a Widget
>>> print([x,2,3])
[repr of a Widget, 2, 3]
>>> print(repr(x))
repr of a Widget
>>> print(str(x))
str of a Widget
定义<$ c $时c> __ repr __ 和 __ str __ 对于您自己的课程，请尝试遵循文档中有关哪一个应该更详细和官方的建议。
When defining __repr__ and __str__ for your own classes, try to follow the documentation's suggestions regarding which one should be more detailed and "official".
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