How can this code print Hello World without any print statement

Question

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.

Answer 1

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!