Proposal: drop support to python 2.7

[domdinicola]

If @vgrem you agree I can create a PR to address this

[vgrem]

@domdinicola might be a good idea, thanks! Although would be interested to get familiar with runtime usage statistics.

p.s. and might be slow with response since on vacation until the end of the month

[domdinicola]

based on this https://en.wikipedia.org/wiki/History_of_Python we should be able to get rid of those since are not officially supported anymore.
enjoy your vacation!

[hugovk]

Here's the pip installs for Office365-REST-Python-Client from PyPI for June 2020:

category	percent	downloads
3.7	78.80%	32,146
3.6	12.61%	5,144
3.5	5.80%	2,367
3.8	1.80%	736
2.7	0.58%	235
null	0.39%	161
3.4	0.01%	6
Total		40,795

Source: pip install -U pypistats && pypistats python_minor Office365-REST-Python-Client --last-month

[domdinicola]

Since between 3.6 and 3.7 we reach more than 90%, I think we can drop 3.5 and 2.7 (3.4 is already not supported)
#233

[kellerza]

This is probably a good time to drop Python 2:

• Stats shows we can drop Python < 3.7
• Requests only supports 3.7+
• There are several typing improvements in Python 3
• Adding async support would need Python 3
• There are already f-strings used in several places (not intentional)

category	percent	downloads
3.9	52.46%	2,456,724
3.8	27.40%	1,283,225
3.7	9.65%	451,871
3.10	6.56%	307,105
3.11	2.57%	120,140
3.12	0.00%	221
null	0.80%	37,480
3.6	0.50%	23,574
2.7	0.05%	2,464
3.5	0.00%	46
3.3	0.00%	3
3.4	0.00%	3
Total		4,682,856

[kellerza]

@domdinicola still interested to work this? (It's hacktoberfest after all 😉)

I've done some typing improvements (#747) and will try to get the most of the static checks passing. Once passing, it's probably a good time to do this. The new typing format is very similar to what we'll use in Python 3, but since it's still supported in Python 3 we don't have to convert everything in one PR. To keep it smaller, probably removing compat.py would be the best start

@vgrem suggested to move to v 3.0.0 of the library

[domdinicola]

@kellerza agree, if needed I could help with this.