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The vendored html2text is *really* old and absolutely not
P3-compatible.
There is a maintained version on Pypy which is, so use that and stop
vendoring html2text.
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In Python 3 the native acceleration module was merged into pickle
directly.
For cross-version simplicity, just use the base module in Python 2 as
well, we can reintroduce the accelerator somehow if it turns out too
much of a performance hit.
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In Python 3, all of these were "consolidated" under urllib(.request,
.parse, .errors) which is inconvenient.
Since we already have hard dependencies on requests and
werkzeug(.urls, which is a backport of Python 3's unicode-aware
urllib.parse) migrate *everything* to that.
A sticking point is urllib2.URLError, those were (mostly) replaced by
the slightly more general IOError which URLError extends.
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In Python 3:
* various builtins and dict methods were changed to return
view/iterable objects rather than lists
* and the separate Python 2 view/iterable builtins and methods were
removed altogether
This is problematic when using these items as list (which the happens
repeatedly in Odoo), but more viciously when iterating *multiple times*
over them (which also happens, which I've messed up multiple times while
writing this, and which is a pain to debug even when you've just created
the issue).
Convert all code using these to semantics-matching cross-version
helper functions to get the LCD behaviour between P2 and P3, and
forbid the builtins via lint.
issue #8530
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Redundant with `in` and removed from Python 3.
Removed odd, old and long-unused UpdatableDict (which defines and uses
has_key) and UpdatableStr (which was nearby and caught in the blast),
validated with al.
(lib2to3.fixes.fix_has_key)
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* `<>` was removed and should be replaced by
`!=` (lib2to3.fixes.fix_ne)
* `\`` was removed and should be replaced by either `repr()` or the
`%r` format string modifier (lib2to3.fixes.fix_repr followed by
hand-rolled edition to replace concatenation)
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