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Adding __aiter__ and __anext__ to Python AsyncioCursor #5354

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dalanmiller commented Feb 3, 2016

Looking at PEP 0492 I'm adding __aiter__ and __anext__ to support the following syntax in Python 3.5.

Talked with @Tryneus about the timeout and felt that an infinite timeout would be the best default for both changefeeds and normal queries. Users can use ._get_next(...) if they want to explicitly set a timeout.

conn = await r.connect("localhost", 28015)
changes = await r.db("python").table("python").changes()["new_val"].run(conn)

# The changes allow for this async for syntax.
async for change in changes:
    # Work with change

Also related to rethinkdb/docs#949.

@dalanmiller dalanmiller changed the title from Adding __aiter__ and __anext__ to AsyncioCursor to Adding __aiter__ and __anext__ to Python AsyncioCursor Feb 3, 2016

@dalanmiller dalanmiller added the Python label Feb 3, 2016

Show outdated Hide outdated drivers/python/rethinkdb/asyncio_net/net_asyncio.py
@@ -71,6 +71,18 @@ def __init__(self, *args, **kwargs):
Cursor.__init__(self, *args, **kwargs)
self.new_response = asyncio.Future()
@asyncio.coroutine
def __aiter__(self):
return self;

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adrianliaw Feb 4, 2016

Semicolon!

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JS has finally truly entrenched itself in my brain. Thanks @adrianliaw.

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JS has finally truly entrenched itself in my brain. Thanks @adrianliaw.

@danielmewes danielmewes added this to the 2.3 milestone Feb 4, 2016

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I added a test file with the suffix _3_5.py3.5 to differentiate from the original asyncio_connection.py since these are the tests using syntax found only in Python 3.5.

All @asyncio.routine decorators have been replaced with async def .... and removing some deprecated asyncio methods in 3.5.

There's a lot of places where the tests use cursor.next where we could now use async for ... in ... to iterate automagically over an awaitable iterable but I wasn't super acquainted with the tests so I left it at this.

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dalanmiller commented Feb 4, 2016

I added a test file with the suffix _3_5.py3.5 to differentiate from the original asyncio_connection.py since these are the tests using syntax found only in Python 3.5.

All @asyncio.routine decorators have been replaced with async def .... and removing some deprecated asyncio methods in 3.5.

There's a lot of places where the tests use cursor.next where we could now use async for ... in ... to iterate automagically over an awaitable iterable but I wasn't super acquainted with the tests so I left it at this.

Show outdated Hide outdated test/rql_test/connections/asyncio_connection_3_5.py
with self.assertRaisesRegexp(r.ReqlDriverError,
"RqlQuery.run must be given"
" a connection to run on."):
r.expr(1).run()

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Is this missing an await?

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Is this missing an await?

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I think before this is merged, it should also include __aenter__ and __aexit__ for r.connect which allow you to write something like:

# Context manager able to suspend execution 
#  during the opening and closing of the connection
async with r.connect('localhost', 28015) as conn:
    res = await r.db("test").table("test").run(conn)

# conn closed automatically 
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dalanmiller commented Feb 5, 2016

I think before this is merged, it should also include __aenter__ and __aexit__ for r.connect which allow you to write something like:

# Context manager able to suspend execution 
#  during the opening and closing of the connection
async with r.connect('localhost', 28015) as conn:
    res = await r.db("test").table("test").run(conn)

# conn closed automatically 
Show outdated Hide outdated test/rql_test/connections/asyncio_connection_3_5.py3_5.test
try:
import asyncio
except ImportError:
# remove this when implimented https://github.com/rethinkdb/rethinkdb/issues/4139

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typo: implimented => implemented (probably in the file you copypastad, as well =/)

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typo: implimented => implemented (probably in the file you copypastad, as well =/)

Show outdated Hide outdated test/rql_test/connections/asyncio_connection_3_5.py3_5.test
sys.stderr.write('This test requires the asyncio module from Python 3.5')
sys.exit(0)
sys.exit(subprocess.call([os.environ.get('INTERPRETER_PATH', 'python'), os.path.join(os.path.dirname(__file__), 'asyncio_connection.py')]))

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It looks like this is launching the other asyncio tests, not the file you've added in this PR.

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It looks like this is launching the other asyncio tests, not the file you've added in this PR.

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I think at least one of the tests should use the async for ... in ... syntax, since that is mostly what this PR adds. It would probably be easiest in the test_cursor_success function.

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Tryneus commented Feb 5, 2016

I think at least one of the tests should use the async for ... in ... syntax, since that is mostly what this PR adds. It would probably be easiest in the test_cursor_success function.

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dalanmiller Feb 27, 2016

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@Tryneus I'm (re)assigning this to you.

Reminder that the ./test-runner says that the asyncio tests are passing just fine but running the test file directly them with your local python3.5 install has most of the tests fail with recursion depth exceptions as well as other fails.

  • I added a couple instances of async for ... in ...., updating from the cursor.fetch_next() pattern.
  • I went and added an awaitable _stop in net_asyncio.py that I think is also necessary.
  • An assert for > Python 3.5 version in the .test file

Also CC: @larkost to check this out.

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dalanmiller commented Feb 27, 2016

@Tryneus I'm (re)assigning this to you.

Reminder that the ./test-runner says that the asyncio tests are passing just fine but running the test file directly them with your local python3.5 install has most of the tests fail with recursion depth exceptions as well as other fails.

  • I added a couple instances of async for ... in ...., updating from the cursor.fetch_next() pattern.
  • I went and added an awaitable _stop in net_asyncio.py that I think is also necessary.
  • An assert for > Python 3.5 version in the .test file

Also CC: @larkost to check this out.

@danielmewes danielmewes modified the milestones: 2.3-polish, 2.3 Apr 5, 2016

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Unfortunately this won't make it into the initial 2.3 driver. We'll try to get it into a point release update afterwards.

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danielmewes commented Apr 5, 2016

Unfortunately this won't make it into the initial 2.3 driver. We'll try to get it into a point release update afterwards.

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The connections/asyncio_connection_3_5.py3.5 setup was pretty broken:

  1. It assumed that test/rql_test/connections/asyncio_connection_3_5.py3_5.test would be run with Python 3.5. Rather it is just run as an executable and the shebang line made that the system default Python (for most systems: 2.7).
  2. That same file then checked if it was running Python 3.5 or greater, then used sys.exit(0). This signals the test system that it passed.
  3. In the case of the wrong version of Python an AssertionError would have been thrown, and not caught by the try block that was set out for it since that latter was looking for an ImportError.
  4. The line that ran the actual test file then chose python3 rather than python3.5 as the default.

With 6651ae7 I have moved the version check into the actual test,and fixed it to run on Python 3.5. I also did some other generic cleanup on stuff that I noticed (e.g.: unneeded imports). The test is, of course, still failing.

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larkost commented Apr 5, 2016

The connections/asyncio_connection_3_5.py3.5 setup was pretty broken:

  1. It assumed that test/rql_test/connections/asyncio_connection_3_5.py3_5.test would be run with Python 3.5. Rather it is just run as an executable and the shebang line made that the system default Python (for most systems: 2.7).
  2. That same file then checked if it was running Python 3.5 or greater, then used sys.exit(0). This signals the test system that it passed.
  3. In the case of the wrong version of Python an AssertionError would have been thrown, and not caught by the try block that was set out for it since that latter was looking for an ImportError.
  4. The line that ran the actual test file then chose python3 rather than python3.5 as the default.

With 6651ae7 I have moved the version check into the actual test,and fixed it to run on Python 3.5. I also did some other generic cleanup on stuff that I noticed (e.g.: unneeded imports). The test is, of course, still failing.

@danielmewes danielmewes modified the milestones: 2.3.x, 2.3-polish Apr 6, 2016

@danielmewes danielmewes modified the milestones: 2.4, 2.3.x May 26, 2016

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Awesome 👍 please

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ultrabug commented May 30, 2016

Awesome 👍 please

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With the recent changes to the test system, we should now just have a single test/rql_test/connections/asyncio_connection_3_5.py3_5.test file that contains the actual test code right?

@dalanmiller Apart from getting the tests work properly, is there anything else missing here that you're aware of?

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danielmewes commented May 31, 2016

With the recent changes to the test system, we should now just have a single test/rql_test/connections/asyncio_connection_3_5.py3_5.test file that contains the actual test code right?

@dalanmiller Apart from getting the tests work properly, is there anything else missing here that you're aware of?

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After thinking about this a little, I think that the best approach would be to add the changes for this into the normal asyncio_connection.py3_4+.test file, but put the testing for __aiter__ and __anext__ behind skipping decorators that check for the version. This would probably work (not checked):

def newInPython3_5(obj, attr):
    if sys.version_info >= (3,5):
        return lambda func: func
    else:
        return unittest.skip('%r requires Python3.5 or above')
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larkost commented Jun 1, 2016

After thinking about this a little, I think that the best approach would be to add the changes for this into the normal asyncio_connection.py3_4+.test file, but put the testing for __aiter__ and __anext__ behind skipping decorators that check for the version. This would probably work (not checked):

def newInPython3_5(obj, attr):
    if sys.version_info >= (3,5):
        return lambda func: func
    else:
        return unittest.skip('%r requires Python3.5 or above')
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After thinking about this a little, I think that the best approach would be to add the changes for this into the normal asyncio_connection.py3_4+.test file, but put the testing for aiter and anext behind skipping decorators that check for the version.

I'm not sure this will work since 3.5 introduced the async keyword. Also there's some difference with asyncio.async which turned into asyncio.ensure_future in 3.5. So the following examples I believe will fail:

async for change in changes():
...
async with r.connect() as conn:
...
async def function():
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dalanmiller commented Jun 1, 2016

After thinking about this a little, I think that the best approach would be to add the changes for this into the normal asyncio_connection.py3_4+.test file, but put the testing for aiter and anext behind skipping decorators that check for the version.

I'm not sure this will work since 3.5 introduced the async keyword. Also there's some difference with asyncio.async which turned into asyncio.ensure_future in 3.5. So the following examples I believe will fail:

async for change in changes():
...
async with r.connect() as conn:
...
async def function():
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@danielmewes I recalled incorrectly that maybe async with still needed some dunder methods but looks like it just needed __aenter__ and __aexit__ so we should be good afaik.

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dalanmiller commented Jun 1, 2016

@danielmewes I recalled incorrectly that maybe async with still needed some dunder methods but looks like it just needed __aenter__ and __aexit__ so we should be good afaik.

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@dalanmiller any chance you could update this PR's code please ?

Your experience on implementing this would be greatly appreciated (I must admit I'm at loss) so we can at least maintain a fork and use it while this PR is merged and released.

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ultrabug commented Jun 14, 2016

@dalanmiller any chance you could update this PR's code please ?

Your experience on implementing this would be greatly appreciated (I must admit I'm at loss) so we can at least maintain a fork and use it while this PR is merged and released.

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@ultrabug Do you mean resolve the current conflicts with next?

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dalanmiller commented Jun 15, 2016

@ultrabug Do you mean resolve the current conflicts with next?

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@dalanmiller that's right so that users in need of these great features can make a patch and apply it to their local lib.

I must say I tried and failed miserably maybe because I couldn't figure out how to fix those relative imports on my development virtualenv in my limited time...

Thanks in advance, I really hope this will be merged soon.

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ultrabug commented Jun 16, 2016

@dalanmiller that's right so that users in need of these great features can make a patch and apply it to their local lib.

I must say I tried and failed miserably maybe because I couldn't figure out how to fix those relative imports on my development virtualenv in my limited time...

Thanks in advance, I really hope this will be merged soon.

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wwoods Jun 20, 2016

Another issue with this: __aiter__ should return the iterator itself, not an awaitable, as per PEP-0492. This was changed in Python 3.5.2 and will be relevant going forward.

wwoods commented Jun 20, 2016

Another issue with this: __aiter__ should return the iterator itself, not an awaitable, as per PEP-0492. This was changed in Python 3.5.2 and will be relevant going forward.

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Hey @wwoods from what I understand, is this sufficient to fix it for Python 3.5.2? I've just removed the @asyncio.coroutine decorator from __aiter__ as shown in the 0492 async iterators example you linked and added await to the self._get_next(None) line in anext.

PEP 492 was accepted in CPython 3.5.0 with aiter defined as a method, that was expected to return an awaitable resolving to an asynchronous iterator.

In 3.5.2 (as PEP 492 was accepted on a provisional basis) the aiter protocol was updated to return asynchronous iterators directly.

Then the requirements listed here - https://www.python.org/dev/peps/pep-0492/#asynchronous-iterators-and-async-for - I think are also met:

  • AsyncioCursor.__aiter__ returns itself directly, not an awaitable
  • AsyncioCursor has a __anext__ async function which returns an awaitable
  • AsyncioCursor.__anext__ returns asyncio.StopAsyncIteration upon falsyness of data
def __aiter__(self):
    return self
@asyncio.coroutine
def __anext__(self):
    data = await self._get_next(None)
    if data:
        return data
    else:
        raise asyncio.StopAsyncIteration
@asyncio.coroutine
    def _get_next(self, timeout):
        waiter = reusable_waiter(self.conn._io_loop, timeout)
        while len(self.items) == 0:
            self._maybe_fetch_batch()
            if self.error is not None:
                raise self.error
            with translate_timeout_errors():
                yield from waiter(asyncio.shield(self.new_response))
        return self.items.popleft()

As soon as I can work it out with tests, I'll push up to this branch.

p.s.
@ultrabug this branch is now merge-able again.

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dalanmiller commented Jun 27, 2016

Hey @wwoods from what I understand, is this sufficient to fix it for Python 3.5.2? I've just removed the @asyncio.coroutine decorator from __aiter__ as shown in the 0492 async iterators example you linked and added await to the self._get_next(None) line in anext.

PEP 492 was accepted in CPython 3.5.0 with aiter defined as a method, that was expected to return an awaitable resolving to an asynchronous iterator.

In 3.5.2 (as PEP 492 was accepted on a provisional basis) the aiter protocol was updated to return asynchronous iterators directly.

Then the requirements listed here - https://www.python.org/dev/peps/pep-0492/#asynchronous-iterators-and-async-for - I think are also met:

  • AsyncioCursor.__aiter__ returns itself directly, not an awaitable
  • AsyncioCursor has a __anext__ async function which returns an awaitable
  • AsyncioCursor.__anext__ returns asyncio.StopAsyncIteration upon falsyness of data
def __aiter__(self):
    return self
@asyncio.coroutine
def __anext__(self):
    data = await self._get_next(None)
    if data:
        return data
    else:
        raise asyncio.StopAsyncIteration
@asyncio.coroutine
    def _get_next(self, timeout):
        waiter = reusable_waiter(self.conn._io_loop, timeout)
        while len(self.items) == 0:
            self._maybe_fetch_batch()
            if self.error is not None:
                raise self.error
            with translate_timeout_errors():
                yield from waiter(asyncio.shield(self.new_response))
        return self.items.popleft()

As soon as I can work it out with tests, I'll push up to this branch.

p.s.
@ultrabug this branch is now merge-able again.

Show outdated Hide outdated drivers/python/rethinkdb/asyncio_net/net_asyncio.py
@asyncio.coroutine
def __anext__(self):
data = self._get_next(None)

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I think this should be data = yield from self._get_next(None) since self._get_next() returns a coroutine and the if data below would always evaluate as True.

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I think this should be data = yield from self._get_next(None) since self._get_next() returns a coroutine and the if data below would always evaluate as True.

Show outdated Hide outdated drivers/python/rethinkdb/asyncio_net/net_asyncio.py
if data:
return data
else:
raise asyncio.StopAsyncIteration

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There's no asyncio.StopAsyncIteration, this should be StopAsyncIteration

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There's no asyncio.StopAsyncIteration, this should be StopAsyncIteration

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@dalanmiller great news, thank you ! I finally got the hold on how to run the lib in develop mode in my virtualenv so I could give it a try and made a few comments as you can see.

Also, I think the _get_next() method is wrongly raising an RqlCursorEmpty exception on line 123. My current fix is checking the error instance type like this:

    @asyncio.coroutine
    def _get_next(self, timeout):
        waiter = reusable_waiter(self.conn._io_loop, timeout)
        while len(self.items) == 0:
            self._maybe_fetch_batch()
            if self.error is not None:
                if isinstance(self.error, RqlCursorEmpty):
                    return
                else:
                    raise self.error
            with translate_timeout_errors():
                yield from waiter(asyncio.shield(self.new_response))
        return self.items.popleft()

Hope this helps

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ultrabug commented Jun 28, 2016

@dalanmiller great news, thank you ! I finally got the hold on how to run the lib in develop mode in my virtualenv so I could give it a try and made a few comments as you can see.

Also, I think the _get_next() method is wrongly raising an RqlCursorEmpty exception on line 123. My current fix is checking the error instance type like this:

    @asyncio.coroutine
    def _get_next(self, timeout):
        waiter = reusable_waiter(self.conn._io_loop, timeout)
        while len(self.items) == 0:
            self._maybe_fetch_batch()
            if self.error is not None:
                if isinstance(self.error, RqlCursorEmpty):
                    return
                else:
                    raise self.error
            with translate_timeout_errors():
                yield from waiter(asyncio.shield(self.new_response))
        return self.items.popleft()

Hope this helps

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wwoods Jun 29, 2016

@dalanmiller Yeah I think that's all that changed.

wwoods commented Jun 29, 2016

@dalanmiller Yeah I think that's all that changed.

@danielmewes danielmewes modified the milestones: 2.3.x, 2.4 Jul 6, 2016

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@danielmewes This is ready for review.

It would be nice to have async with r.connect() as conn: but it would involve modifications to net_asyncio.Connection.reconnect to not be a coroutine. So in order for it to work at the moment, it needs to be:

async with await r.connect() as conn:
    pass

The problem being that we want to manage the context of the connection itself not the connection function. So __aexit__ and __aenter__ are defined there.

A good example of this properly done is aiohttp:

with aiohttp.ClientSession() as session:
    async with session.get('https://api.github.com/events') as resp:
        print(resp.status)
        print(await resp.text())

Where here it's defined that there's a standard non-coroutine def request which synchronously returns a class implementing __aexit__ and __aenter__ which wraps the coroutine request (and sends .

I say for the moment we ship this and put fixing the context manager properly at a later time and also spend some time to write some more comments.

Alternatively, we can also ship everything except the async with functionality in a half-baked state.

Thanks to @sseg for some pointers on this.

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dalanmiller commented Jul 8, 2016

@danielmewes This is ready for review.

It would be nice to have async with r.connect() as conn: but it would involve modifications to net_asyncio.Connection.reconnect to not be a coroutine. So in order for it to work at the moment, it needs to be:

async with await r.connect() as conn:
    pass

The problem being that we want to manage the context of the connection itself not the connection function. So __aexit__ and __aenter__ are defined there.

A good example of this properly done is aiohttp:

with aiohttp.ClientSession() as session:
    async with session.get('https://api.github.com/events') as resp:
        print(resp.status)
        print(await resp.text())

Where here it's defined that there's a standard non-coroutine def request which synchronously returns a class implementing __aexit__ and __aenter__ which wraps the coroutine request (and sends .

I say for the moment we ship this and put fixing the context manager properly at a later time and also spend some time to write some more comments.

Alternatively, we can also ship everything except the async with functionality in a half-baked state.

Thanks to @sseg for some pointers on this.

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@Tryneus could you review the updated code please?

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danielmewes commented Jul 11, 2016

@Tryneus could you review the updated code please?

@danielmewes danielmewes modified the milestones: 2.3.x, 2.3.5 Jul 28, 2016

@danielmewes danielmewes modified the milestones: 2.3.x, 2.3.5 Aug 22, 2016

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@dalanmiller This now has a merge conflict. I suspect due to changes to the asyncio test in next that @larkost made. Do you have time to update the branch?

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danielmewes commented Sep 14, 2016

@dalanmiller This now has a merge conflict. I suspect due to changes to the asyncio test in next that @larkost made. Do you have time to update the branch?

@EggieCode EggieCode referenced this pull request Mar 9, 2017

Merged

Adding __aiter__ and __anext__ to Python AsyncioCursor #6291

1 of 1 task complete

@AtnNn AtnNn modified the milestones: duplicate, 2.3.x Mar 17, 2017

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Merged in #6291

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AtnNn commented Mar 17, 2017

Merged in #6291

@AtnNn AtnNn closed this Mar 17, 2017

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@AtnNn awesome news, thanks a lot !

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ultrabug commented Mar 17, 2017

@AtnNn awesome news, thanks a lot !

@srh srh deleted the dalanmiller_aiter_and_anext branch Nov 7, 2017

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