这段代码如何在没有任何打印语句的情况下打印Hello World(How can this code print Hello World without any print statement)

我在Python中发现了这个代码，它在不使用字符串“Hello World”的情况下打印“Hello World”。它是一行代码，一个表达式（即没有打印语句）。

(lambda _, __, ___, ____, _____, ______, _______, ________: getattr(__import__(True.__class__.__name__[_] + [].__class__.__name__[__]), ().__class__.__eq__.__class__.__name__[:__] + ().__iter__().__class__.__name__[_____:________])(_, (lambda _, __, ___: _(_, __, ___))(lambda _, __, ___: chr(___ % __) + _(_, __, ___ // __) if ___ else (lambda: _).func_code.co_lnotab, _ << ________, (((_____ << ____) + _) << ((___ << _____) - ___)) + (((((___ << __) - _) << ___) + _) << ((_____ << ____) + (_ << _))) + (((_______ << __) - _) << (((((_ << ___) + _)) << ___) + (_ << _))) + (((_______ << ___) + _) << ((_ << ______) + _)) + (((_______ << ____) - _) << ((_______ << ___))) + (((_ << ____) - _) << ((((___ << __) + _) << __) - _)) - (_______ << ((((___ << __) - _) << __) + _)) + (_______ << (((((_ << ___) + _)) << __))) - ((((((_ << ___) + _)) << __) + _) << ((((___ << __) + _) << _))) + (((_______ << __) - _) << (((((_ << ___) + _)) << _))) + (((___ << ___) + _) << ((_____ << _))) + (_____ << ______) + (_ << ___))))(*(lambda _, __, ___: _(_, __, ___))((lambda _, __, ___: [__(___[(lambda: _).func_code.co_nlocals])] + _(_, __, ___[(lambda _: _).func_code.co_nlocals:]) if ___ else []), lambda _: _.func_code.co_argcount, (lambda _: _, lambda _, __: _, lambda _, __, ___: _, lambda _, __, ___, ____: _, lambda _, __, ___, ____, _____: _, lambda _, __, ___, ____, _____, ______: _, lambda _, __, ___, ____, _____, ______, _______: _, lambda _, __, ___, ____, _____, ______, _______, ________: _)))

因为它是单行代码，所以这是一个格式良好的代码，它更具可读性。

它仅由函数，属性访问，列表，元组，基本数学，一个True和一个星标组成。它具有最少的内建使用量（ __import__ ， getattr和chr每次一次）。

我很难理解它。它有什么可能的解释吗？

顺便说一下，代码的作者解释了它的工作原理。

I found this code in Python, which prints "Hello World" without the use of the string "Hello World". It's a one line code, a single expression (i.e. no print statement).

(lambda _, __, ___, ____, _____, ______, _______, ________: getattr(__import__(True.__class__.__name__[_] + [].__class__.__name__[__]), ().__class__.__eq__.__class__.__name__[:__] + ().__iter__().__class__.__name__[_____:________])(_, (lambda _, __, ___: _(_, __, ___))(lambda _, __, ___: chr(___ % __) + _(_, __, ___ // __) if ___ else (lambda: _).func_code.co_lnotab, _ << ________, (((_____ << ____) + _) << ((___ << _____) - ___)) + (((((___ << __) - _) << ___) + _) << ((_____ << ____) + (_ << _))) + (((_______ << __) - _) << (((((_ << ___) + _)) << ___) + (_ << _))) + (((_______ << ___) + _) << ((_ << ______) + _)) + (((_______ << ____) - _) << ((_______ << ___))) + (((_ << ____) - _) << ((((___ << __) + _) << __) - _)) - (_______ << ((((___ << __) - _) << __) + _)) + (_______ << (((((_ << ___) + _)) << __))) - ((((((_ << ___) + _)) << __) + _) << ((((___ << __) + _) << _))) + (((_______ << __) - _) << (((((_ << ___) + _)) << _))) + (((___ << ___) + _) << ((_____ << _))) + (_____ << ______) + (_ << ___))))(*(lambda _, __, ___: _(_, __, ___))((lambda _, __, ___: [__(___[(lambda: _).func_code.co_nlocals])] + _(_, __, ___[(lambda _: _).func_code.co_nlocals:]) if ___ else []), lambda _: _.func_code.co_argcount, (lambda _: _, lambda _, __: _, lambda _, __, ___: _, lambda _, __, ___, ____: _, lambda _, __, ___, ____, _____: _, lambda _, __, ___, ____, _____, ______: _, lambda _, __, ___, ____, _____, ______, _______: _, lambda _, __, ___, ____, _____, ______, _______, ________: _)))

As it is a single line code, Here's a well formatted code which is more readable.

It is made up of only functions, attribute access, lists, tuples, basic math, one True, and one star-args. It has minimal builtin usage (__import__, getattr, and chr once each).

It's really hard for me to understand it. Is there any possible explanation of what it does?

Here, by the way, is where the author of the code explains how it works.

最满意答案

这个问题的答案如下：代码避免了os.write()到stdout的文件描述符的print语句，该文件描述符为1 ：

getattr(__import__("os"), "write")(1, "Hello world!\n")

其余的解释详见https://benkurtovic.com/2014/06/01/obfuscating-hello-world.html 。不要在这里总结，只要阅读原文！

The answer to the question as written: The code avoids a print statement by os.write()ing to stdout's file descriptor, which is 1:

getattr(__import__("os"), "write")(1, "Hello world!\n")

The rest of the explanation is detailed at https://benkurtovic.com/2014/06/01/obfuscating-hello-world.html. Instead of a summary here, just read the original!

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