Insteon with 2448A7: "SyntaxError: invalid syntax" when initializing component

[synthead]

Home Assistant release with the issue: 0.77.3

Last working Home Assistant release (if known): n/a

Operating environment (Hass.io/Docker/Windows/etc.): Arch Linux

Component/platform: Insteon

Description of problem: Python exception is raised when initializing Insteon component (see backtrace)

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

insteon:
  port: /dev/ttyUSB2

Traceback (if applicable):

2018-09-15 22:58:05 INFO (MainThread) [homeassistant.setup] Setting up insteon
2018-09-15 22:58:05 ERROR (MainThread) [homeassistant.setup] Error during setup of component insteon
Traceback (most recent call last):
  File "/usr/lib/python3.7/site-packages/homeassistant/setup.py", line 145, in _async_setup_component
    hass, processed_config)
  File "/usr/lib/python3.7/site-packages/homeassistant/components/insteon/__init__.py", line 143, in async_setup
    import insteonplm
  File "/var/lib/hass/deps/lib/python3.7/site-packages/insteonplm/__init__.py", line 22
    ensure_future = asyncio.async
                                ^
SyntaxError: invalid syntax

[scop]

Looks like insteonplm is not ready for Python 3.7: nugget/python-insteonplm#107
Until it is, I suggest trying with 3.6.x.

[scop]

More 3.7 WIP in #15479

[synthead]

Found a workaround. Edit deps/lib/python3.7/site-packages/insteonplm/__init__.py and change this:

try:
    ensure_future = asyncio.ensure_future
except AttributeError:
    ensure_future = asyncio.async

...to just this:

ensure_future = asyncio.ensure_future

[scop]

Or better IMO, apply the change from the above mentioned insteonplm PR:
nugget/python-insteonplm@f77c141

[teharris1]

Thanks for finding this issue with 3.7. Currently the lowest release supported by insteonplm is 3.4. Hence the different future scheduling. I will take a look at the PR mentioned. if this is the only issue the I can turn something around quickly to support 3.7.

[scop]

As mentioned in the PR, a bunch of test failures remain after that change, so it's likely that some more work is needed. https://travis-ci.org/nugget/python-insteonplm/jobs/429158686

[teharris1]

Yeah, looks like 3.7 requires 3.5.3 syntax for async and await rather than coroutines and yield from. That is a bigger change. This means dropping 3.4 support I believe. but it is probably time for that anyway.