Error installing Python 2 via Homebrew on MacOS Mojave

I'm having a lot of trouble with installing Python 2.7 on the MacOS 10.14 Mojave Beta.

I've tried re-installing the command line tools and then installing Python 2.7 as suggested here and here, but am still having issues - below is my output:

NickLaptop:~ nicholasarner$ brew reinstall python@2
==> Reinstalling python@2 
==> Downloading https://www.python.org/ftp/python/2.7.15/Python-2.7.15.tar.xz
Already downloaded: /Users/nicholasarner/Library/Caches/Homebrew/python@2-2.7.15.tar.xz
==> ./configure --prefix=/usr/local/Cellar/python@2/2.7.15_1 --enable-ipv6 --datarootdir=/usr/l
==> make
==> make install PYTHONAPPSDIR=/usr/local/Cellar/python@2/2.7.15_1
==> make frameworkinstallextras PYTHONAPPSDIR=/usr/local/Cellar/python@2/2.7.15_1/share/python@
==> Downloading https://files.pythonhosted.org/packages/1a/04/d6f1159feaccdfc508517dba1929eb93a
Already downloaded: /Users/nicholasarner/Library/Caches/Homebrew/python@2--setuptools-39.2.0.zip
==> Downloading https://files.pythonhosted.org/packages/ae/e8/2340d46ecadb1692a1e455f13f75e596d
Already downloaded: /Users/nicholasarner/Library/Caches/Homebrew/python@2--pip-10.0.1.tar.gz
==> Downloading https://files.pythonhosted.org/packages/2a/fb/aefe5d5dbc3f4fe1e815bcdb05cbaab19
Already downloaded: /Users/nicholasarner/Library/Caches/Homebrew/python@2--wheel-0.31.1.tar.gz
==> make html
Last 15 lines from /Users/nicholasarner/Library/Logs/Homebrew/python@2/05.make:
    return build_main(argv)
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/cmd/build.py", line 22, in build_main
    from sphinx import cmdline
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/cmdline.py", line 23, in <module>
    from sphinx.application import Sphinx
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/application.py", line 29, in <module>
    from sphinx.config import Config
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/config.py", line 21, in <module>
    from sphinx.util import logging
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/util/__init__.py", line 33, in <module>
    from sphinx.util import logging
  File "/usr/local/Cellar/sphinx-doc/1.7.5_1/libexec/lib/python2.7/site-packages/sphinx/util/logging.py", line 106, in <module>
    class SphinxLoggerAdapter(logging.LoggerAdapter):
AttributeError: 'module' object has no attribute 'LoggerAdapter'
make: *** [build] Error 1
Do not report this issue to Homebrew/brew or Homebrew/core!
These open issues may also help:
python 3.7.0 https://github.com/Homebrew/homebrew-core/pull/29490
python upgrade failing https://github.com/Homebrew/homebrew-core/issues/29214
app-engine-python 1.9.70 https://github.com/Homebrew/homebrew-core/pull/28858
molecule: Use correct `docker` python package dependency https://github.com/Homebrew/homebrew-core/pull/28635
[root] formula does not link against python@2 correctly. https://github.com/Homebrew/homebrew-core/issues/29377
clingo add support for lua, use python 3 https://github.com/Homebrew/homebrew-core/pull/28057
OSError: [Errno 1] Operation not permitted for python@2 –with-tcl-tk https://github.com/Homebrew/homebrew-core/issues/28168
Error: You are using macOS 10.14.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues.
Error: You are using macOS 10.14.
We do not provide support for this pre-release version.
You may encounter build failures or other breakages.
Please create pull-requests instead of filing issues

Any help is appreciated!

EDIT Please don't suggest Anaconda! For what I'm working on, I specifically need a framework built version of Python via Brew.

from Error installing Python 2 via Homebrew on MacOS Mojave

2FA Setup in PHP will not scan QR code on iOS

I am using this documentation on setting up 2FA for my web app.

https://github.com/Voronenko/PHPOTP/wiki/Simple-PHP-implementation-of-two-factor-authentication

I have managed to implement it fine and i am using the Authy app which works great on Android, however when trying to scan the QR code on an iOS device, its saying the QR Code is invalid.

I cannot work out why its saying the QR Code is invalid.

I am using this PHP code to generate the QR code:

print sprintf('<img src="%s"/>',TokenAuth6238::getBarCodeUrl('user', 'url', $secretkey, 'issuer'));

There are no problems on Android, iOS will work to generate the authentication code and verify when setup using the key manually but the QR just will not scan.

Does anyone have any ideas what could cause this to happen?

from 2FA Setup in PHP will not scan QR code on iOS

How does asyncio actually work?

This question is motivated by my another question: How to await in cdef?

There are tons of articles and blog posts on the web about asyncio, but they are all very superficial. I couldn't find any information about how asyncio is actually implemented, and what makes I/O asynchronous. I was trying to read the source code, but it's thousands of lines of not the highest grade C code, a lot of which deals with auxiliary objects, but most crucially, it is hard to connect between Python syntax and what C code it would translate into.

Asycnio's own documentation is even less helpful. There's no information there about how it works, only some guidelines about how to use it, which are also sometimes misleading / very poorly written.

I'm familiar with Go's implementation of coroutines, and was kind of hoping that Python did the same thing. If that was the case, the code I came up in the post linked above would have worked. Since it didn't, I'm now trying to figure out why. My best guess so far is as follows, please correct me where I'm wrong:

1. Procedure definitions of the form async def foo(): ... are actually interpreted as methods of a class inheriting coroutine.
2. Perhaps, async def is actually split into multiple methods by await statements, where the object, on which these methods are called is able to keep track of the progress it made through the execution so far.
3. If the above is true, then, essentially, execution of a coroutine boils down to calling methods of coroutine object by some global manager (loop?).
4. The global manager is somehow (how?) aware of when I/O operations are performed by Python (only?) code and is able to choose one of the pending coroutine methods to execute after the current executing method relinquished control (hit on the await statement).

In other words, here's my attempt at "desugaring" of some asyncio syntax into something more understandable:

async def coro(name):
    print('before', name)
    await asyncio.sleep()
    print('after', name)

asyncio.gather(coro('first'), coro('second'))

# translated from async def coro(name)
class Coro(coroutine):
    def before(self, name):
        print('before', name)

    def after(self, name):
        print('after', name)

    def __init__(self, name):
        self.name = name
        self.parts = self.before, self.after
        self.pos = 0

    def __call__():
        self.parts[self.pos](self.name)
        self.pos += 1

    def done(self):
        return self.pos == len(self.parts)


# translated from asyncio.gather()
class AsyncIOManager:

    def gather(*coros):
        while not every(c.done() for c in coros):
            coro = random.choice(coros)
            coro()

Should my guess prove correct: then I have a problem. How does I/O actually happen in this scenario? In a separate thread? Is the whole interpreter suspended and I/O happens outside the interpreter? What exactly is meant by I/O? If my python procedure called C open() procedure, and it in turn sent interrupt to kernel, relinquishing control to it, how does Python interpreter know about this and is able to continue running some other code, while kernel code does the actual I/O and until it wakes up the Python procedure which sent the interrupt originally? How can Python interpreter in principle, be aware of this happening?

from How does asyncio actually work?