没想到 Python 中竟然还藏着这些稀奇古怪的东西...

>>> import __hello__
Hello world!

>>> from __future__ import braces
  File "<stdin>", line 1
SyntaxError: not a chance

future_check_features(PyFutureFeatures *ff, stmt_ty s, const char *filename)
...
  else if (strcmp(feature, "braces") == 0) {
    PyErr_SetString(PyExc_SyntaxError,
        "not a chance");
    PyErr_SyntaxLocation(filename, s->lineno);
    return 0;
  }

>>> from __future__ import barry_as_FLUFL
>>> "Python" <> "C++"
True
>>> "Python" != "C++"
  File "<stdin>", line 1
    "Python" != "C++"
              ^
SyntaxError: with Barry as BDFL, use '<>' instead of '!='

>>> import antigravity

>>> import this

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!

>>> love = this
>>> this is love
True

>>> love is True
False
>>> love is False
False
>>> love is not True or False
True
>>> love is love
True