Decide supported Python 3.x versions (current code is 3.4+) #25
Description
In #14 we decided not to support Python 2. But with the current code base, we do not even support 3.6, even though setup.py claims we support 3.4. While it would be nice to be on 3.7 only, I think we should at the very least support 3.6. Demo:
user@pc:~/opentelemetry-python/opentelemetry-api$ cat /etc/issue.net
Ubuntu 18.04.2 LTS
user@pc:~/opentelemetry-python/opentelemetry-api$ python3 --version # Note that this is the latest Python version in this Ubuntu version
Python 3.6.8
user@pc:~/opentelemetry-python/opentelemetry-api$ python3 -c 'import opentelemetry.trace'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/mnt/c/workspaces/misc/opentelemetry-python/opentelemetry-api/opentelemetry/trace/__init__.py", line 65
from __future__ import annotations
^
SyntaxError: future feature annotations is not definedThis is PEP 563 which requires 3.7.
Type hints in general seem to be supported since 3.5 / PEP 484. But note that instance/class variable type hints would only be available since 3.6 (PEP 526).