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the pep484 task becomes more intense as there is mounting
pressure to come up with a consistency in how data moves
from end-user to instance variable.
current thinking is coming into:
1. there are _typing._XYZArgument objects that represent "what the
user sent"
2. there's the roles, which represent a kind of "filter" for different
kinds of objects. These are mostly important as the argument
we pass to coerce().
3. there's the thing that coerce() returns, which should be what the
construct uses as its internal representation of the thing.
This is _typing._XYZElement.
but there's some controversy over whether or
not we should pass actual ClauseElements around by their role
or not. I think we shouldn't at the moment, but this makes the
"role-ness" of something a little less portable. Like, we have
to set DMLTableRole for TableClause, Join, and Alias, but then
also we have to repeat those three types in order to set up
_DMLTableElement.
Other change introduced here, there was a deannotate=True
for the left/right of a sql.join(). All tests pass without that.
I'd rather not have that there as if we have a join(A, B) where
A, B are mapped classes, we want them inside of the _annotations.
The rationale seems to be performance, but this performance can
be illustrated to be on the compile side which we hope is cached
in the normal case.
CTEs now accommodate for text selects including recursive.
Get typing to accommodate "util.preloaded" cleanly; add "preloaded"
as a real module. This seemed like we would have needed
pep562 `__getattr__()` but we don't, just set names in
globals() as we import them.
References: #6810
Change-Id: I34d17f617de2fe2c086fc556bd55748dc782faf0
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__future__.annotations mode allows us to use non-string
annotations for argument and return types in most cases,
but more importantly it removes a large amount of runtime
overhead that would be spent in evaluating the annotations.
Change-Id: I2f5b6126fe0019713fc50001be3627b664019ede
References: #6810
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Starting to set up practices and conventions to
get the library typed.
Key goals for typing are:
1. whole library can pass mypy without any strict
turned on.
2. we can incrementally turn on some strict flags on a per-package/
module basis, as here we turn on more strictness for sqlalchemy.util, exc,
and log
3. mypy ORM plugin tests work fully without sqlalchemy2-stubs
installed
4. public facing methods all have return types, major parameter
signatures filled in also
5. Foundational elements like util etc. are typed enough so that
we can use them in fully typed internals higher up the stack.
Conventions set up here:
1. we can use lots of config in setup.cfg to limit where mypy
is throwing errors and how detailed it should be in different
packages / modules. We can use this to push up gerrits
that will pass tests fully without everything being typed.
2. a new tox target pep484 is added. this links to a new jenkins
pep484 job that works across all projects (alembic, dogpile, etc.)
We've worked around some mypy bugs that will likely
be around for awhile, and also set up some core practices
for how to deal with certain things such as public_factory
modules (mypy won't accept a module from a callable at all,
so need to use simple type checking conditionals).
References: #6810
Change-Id: I80be58029896a29fd9f491aa3215422a8b705e12
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Change-Id: I49abf2607e0eb0623650efdf0091b1fb3db737ea
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Change-Id: I8172fdcc3103ff92aa049827728484c8779af6b7
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Also replace http://pypi.python.org/pypi with https://pypi.org/project
Change-Id: I84b5005c39969a82140706472989f2a30b0c7685
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Change-Id: Ic5bb19ca8be3cb47c95a0d3315d84cb484bac47c
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* Fix subclass traversals to not run classes multiple times
* switch compiler visitor to use an attrgetter, to avoid
an eval() at startup time
* don't pre-generate traversal functions, there's lots of these
which are expensive to generate at once and most applications
won't use them all; have it generate them on first use instead
* Some ideas about removing asyncio imports, they don't seem to
be too signficant, apply some more simplicity to the overall
"greenlet fallback" situation
Fixes: #5681
Change-Id: Ib564ddaddb374787ce3e11ff48026e99ed570933
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Repaired a function-level import that was not using SQLAlchemy's standard
late-import system within the sqlalchemy.exc module.
Moved preloaded to sqlalchemy.util.preloaded so that it
does not depend on langhelpers which depends on exc.
Fixes: #5632
Change-Id: I61b7ce9cd461071ce543714739f67aa5aeb47fd6
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