On 10/15/2018 08:24 PM, Tim Burke wrote:
On Oct 15, 2018, at 5:00 PM, Monty Taylor <mord...@inaugust.com
<mailto:mord...@inaugust.com>> wrote:
If we decide as a community to shift our testing of python3 to be 3.6
- or even 3.7 - as long as we still are testing 2.7, I'd argue we're
adequately covered for 3.5.
That's not enough for me to be willing to declare support. I'll grant
that we'd catch the obvious SyntaxErrors, but that could be achieved
just as easily (and probably more cheaply, resource-wise) with multiple
linter jobs. The reason you want unit tests to actually run is to catch
the not-so-obvious bugs.
For example: there are a bunch of places in Swift's proxy-server where
we get a JSON response from a backend server, loads() it up, and do some
work based on it. As I've been trying to get the proxy ported to py3, I
keep writing json.loads(rest.body.decode()). I'll sometimes get pushback
from reviewers saying this shouldn't be necessary, and then I need to
point out that while json.loads() is happy to accept either bytes or
unicode on both py27 and py36, bytes will cause a TypeError on py35. And
since https://bugs.python.org/issue17909 was termed an enhancement and
not a regression (I guess the contract is str-or-unicode, for whatever
str is?), I'm not expecting a backport.
TLDR; if we want to say that something works, best to actually test that
it works. I might be willing to believe that py35 and py37 working
implies that py36 will work, but py27 -> py3x tells me little about
whether py3w works for any w < x.
Fair point - you've convinced me!
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