Cannot support Python 2.x

[tylerlong]

https://pypi.org/project/observable/

Note: We are Python 3 only! Only Python Versions >= 3.5 are supported. Use v0.3.2 for older Python Versions.

This SDK specifies observable>=0.3.1 in requirements. I think we need to change it to observable==0.3.2

[byrnereese]

I have an aching suspicion that the following error stems from this reported issue:

Traceback (most recent call last):
  File "sms.py", line 1, in <module>
    from ringcentral import SDK
  File "/usr/local/lib/python2.7/site-packages/ringcentral/__init__.py", line 4, in <module>
    from .sdk import SDK
  File "/usr/local/lib/python2.7/site-packages/ringcentral/sdk.py", line 4, in <module>
    from .platform import Platform
  File "/usr/local/lib/python2.7/site-packages/ringcentral/platform/__init__.py", line 5, in <module>
    from .platform import Platform
  File "/usr/local/lib/python2.7/site-packages/ringcentral/platform/platform.py", line 5, in <module>
    from observable import Observable
  File "/usr/local/lib/python2.7/site-packages/observable/__init__.py", line 7, in <module>
    from .core import Observable, EventNotFound, HandlerNotFound
  File "/usr/local/lib/python2.7/site-packages/observable/core.py", line 15
    def __init__(self, event: str, handler: T.Callable) -> None:
                            ^
SyntaxError: invalid syntax

[yanminhui]

https://pypi.org/project/observable/

Note: We are Python 3 only! Only Python Versions >= 3.5 are supported. Use v0.3.2 for older Python Versions.

This SDK specifies observable>=0.3.1 in requirements. I think we need to change it to observable==0.3.2

Function annotation syntax has been a Python feature since version 3.0. See PEP 3107

It may be another way to fix this issue by copy the source files to this SDK's source directories, then check function's type of parameter by isinstanceof.

[kirill-konshin]

Fixed