函数,我得到这样的输出: < __ main __。Foobar实例在0x7ff2a18c>有没有办法我可以设置打印行为(或 例如,当我在类对象上调用 print()时,我想以特定格式打印其数据成员。如何在Python中实现这一点? 如果你熟悉C ++类,上述可以实现标准 ostream 添加 朋友ostream&运算符<< (ostream& const foobar&) 方法。解决方案 p> >>> class Test: ... def __repr __(self): ... returnTest() ... def __str __(self): ... return member of Test ... >>> t = Test()>>>> t Test()>>>> print t Test 的成员 __ str __ 方法是当你打印它会发生什么,并且 __ repr __ 方法是当你使用 repr()函数(或当你看到它与交互式提示)。如果这不是最强的方法,对此我深表歉意,因为我还在学习,但它的工作原理。 如果没有 __ str __ 方法,Python将打印 __ repr __ 的结果。如果你定义 __ str __ 而不是 __ repr __ ,Python将使用你在上面看到的 __ repr__ ,但仍然使用 __ str __ 进行打印。 I am learning the ropes in Python. When I try to print an object of class Foobar using the print() function, I get an output like this:<__main__.Foobar instance at 0x7ff2a18c>Is there a way I can set the printing behaviour (or the string representation) of a class and its objects? For instance, when I call print() on a class object, I would like to print its data members in a certain format. How to achieve this in Python?If you are familiar with C++ classes, the above can be achieved for the standard ostream by adding a friend ostream& operator << (ostream&, const Foobar&) method for the class. 解决方案 >>> class Test:... def __repr__(self):... return "Test()"... def __str__(self):... return "member of Test"...>>> t = Test()>>> tTest()>>> print tmember of TestThe __str__ method is what happens when you print it, and the __repr__ method is what happens when you use the repr() function (or when you look at it with the interactive prompt). If this isn't the most Pythonic method, I apologize, because I'm still learning too - but it works.If no __str__ method is given, Python will print the result of __repr__ instead. If you define __str__ but not __repr__, Python will use what you see above as the __repr__, but still use __str__ for printing. 这篇关于如何使用print()打印类或类的对象?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 上岸,阿里云!