Move from Python 2.7 to Python 3.

[elenzil]

There's a couple motivations for this, from most significant to least, imo:

• python 3 offers more modern concurrency models,
  which would allow us to move away from the Threads currently in use in the examples.
• python 3 has broader current adoption and is more standard currently.

I attempted this, but my python-foo ran out in getting the AdaFruit library to work with Python 3.
However it seems like that should not be an exotic use-case, so perhaps there's something obvious i'm missing.

[hawflakes]

I have gotten some partial success by patching the Adafruit library. I'm going to work on it a bit more and then prepare a PR.

python 01_hello_world.py 
Disconnecting any connected robots..
Searching for robot types: (all) with names: (any).
matching robots: 1  non-matching robots: 0 ......        
Connecting to WW_ROBOT_DASH "Po"
Connected to 'Po'!
Starting a thread for Po.
> /Users/jack/play/py3/WonderPyExamples/tutorial/01_hello_world.py(31)thread_hello()
-> sound_names = self.get_hello_sounds(robot)
(Pdb) 2018-08-01 02:57:40.976 python[19009:2134353] *** Terminating app due to uncaught exception 'OC_PythonException', reason: '<class 'TypeError'>: ord() expected string of length 1, but int found'
*** First throw call stack:
(
	0   CoreFoundation                      0x00007fff4fb722db __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x00007fff76d22c76 objc_exception_throw + 48
	2   CoreFoundation                      0x00007fff4fb72229 -[NSException raise] + 9
	3   _objc.cpython-36m-darwin.so         0x0000000107f971ce PyObjCErr_ToObjCWithGILState + 46
	4   _objc.cpython-36m-darwin.so         0x0000000107fd4604 -[OC_PythonObject forwardInvocation:] + 820
	5   CoreFoundation                      0x00007fff4fae855c ___forwarding___ + 748
	6   CoreFoundation                      0x00007fff4fae81e8 _CF_forwarding_prep_0 + 120
	7   CoreBluetooth                       0x00007fff4f611e91 -[CBPeripheral handleAttributeEvent:args:attributeSelector:delegateSelector:delegateFlag:] + 241
	8   CoreBluetooth                       0x00007fff4f611fcd -[CBPeripheral handleCharacteristicEvent:characteristicSelector:delegateSelector:delegateFlag:] + 115
	9   CoreBluetooth                       0x00007fff4f60da1f -[CBPeripheral handleMsg:args:] + 297
	10  CoreBluetooth                       0x00007fff4f6084cb -[CBCentralManager handleMsg:args:] + 198
	11  CoreBluetooth                       0x00007fff4f6168ae __30-[CBXpcConnection _handleMsg:]_block_invoke + 53
	12  libdispatch.dylib                   0x00007fff7790a5fa _dispatch_call_block_and_release + 12
	13  libdispatch.dylib                   0x00007fff77902db8 _dispatch_client_callout + 8
	14  libdispatch.dylib                   0x00007fff77917217 _dispatch_queue_serial_drain + 635
	15  libdispatch.dylib                   0x00007fff7790a166 _dispatch_queue_invoke + 373
	16  libdispatch.dylib                   0x00007fff7790e221 _dispatch_main_queue_callback_4CF + 776
	17  CoreFoundation                      0x00007fff4fb2ac19 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
	18  CoreFoundation                      0x00007fff4faecdfa __CFRunLoopRun + 2586
	19  CoreFoundation                      0x00007fff4faec153 CFRunLoopRunSpecific + 483
	20  Foundation                          0x00007fff51be8f26 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 277
	21  _objc.cpython-36m-darwin.so         0x0000000107fd78c7 ffi_call_unix64 + 79
	22  ???                                 0x00007ffee8dddee0 0x0 + 140732805275360
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Abort trap: 6

[hawflakes]

The solution to the first hurdle is found here: https://github.com/adafruit/Adafruit_Python_BluefruitLE/pull/31/files

[hawflakes]

Here's the PR #9

[m42e]

As life of python 2.7 is nearly at an end. What is the current status of migrating to py3?

[duckida]

As life of python 2.7 is nearly at an end. What is the current status of migrating to py3?

What is migration status?