Prototype async REPL using IPython, take III #11265

Carreau · 2018-08-14T01:51:48Z

This is a squash and a rebase of a large number of commits from Min and
I. For simplicity of managing it, history has been reduced to a single
commit, but more historical versions can be found, in particular in
PR #11155, or commit aedb5d6 to be more
exact.

--

I'm expecting some errors in the squash and resolve of conflicts, so will iterate on it.

This is a squash and a rebase of a large number of commits from Min and I. For simplicity of managing it, history has been reduced to a single commit, but more historical versions can be found, in particular in PR 11155, or commit aedb5d6 to be more exact.

Carreau · 2018-08-14T19:02:26Z

I'm thinking of dropping 3.4, as maintaining compat with it will be painful:

There are no specific plans for the next release of Python 3.4. However, the expectation is that Python 3.4.10 will be released in March of 2019, and this will be the final release of Python 3.4.

We'll also be supporting 3.5, 3.6 and 3.7.

@minrk and @takluyver thoughts ?

minrk · 2018-08-16T13:47:34Z

asyncio support is pretty valuable and long overdue, so if 3.4 makes it too hard, I think the trade-off is worth it.

minrk · 2018-08-16T13:50:34Z

setup.py


 extras_require.update({
    ':python_version == "3.4"': ['typing'],
+    ':python_version >= "3.5"': ['trio', 'curio'],


Neither of these are dependencies, right? We shouldn't require these packages.

One of them is necessary if we want to have nested embed(). I can make that optional, I probably added them here to have the test passing.

call async loops synchronously on their own. ipython#11265

call async loops synchronously on their own. ipython#11265 Handle early return conditions from coro

dalejung · 2018-08-21T17:30:16Z

@Carreau I ran into an issue running python files that have their own loop calls. So if I have a file that calls run_until_complete, it'll break when %run since it nests within the loop_runners own call.

Can we change the run_cell_async coro to first yield interactivity so it can call the pseudo sync when async is not required?

dalejung@8d38b3c

is a working example. await statements in the shell work while running or calling funcs/files that invoke their own loops work as well.

Carreau · 2018-08-21T18:09:14Z

I have to better understand the implication. It is likely possible, though it will likely work only on terminal IPython.

It might also not stay forever, as in the end I want IPython to always run on an event loop. Though, I guess we could run only on the pseudo-sync, or a non-asyncio one.

Once that hapend we can figure out how to patch %run in order to patch run_until_complete

njsmith · 2018-08-22T07:50:27Z

The way I would imagine it working in the long run is:

The async annotations spread out from run_cell to infect the rest of IPython, so that the whole program runs under a single call to the event loop
By default IPython starts out in 'sync' mode, which means:
- Using the pseudo-sync runner
- Raise SyntaxError if someone tries to use a top-level await in a cell
You can switch from 'sync' mode to 'asyncio' mode, 'trio' mode etc., which switches IPython to using these loops
- Internally, this loop switcheroo can be accomplished by yielding a special value to the pseudo-sync runner, which then resumes the same coroutine object under the new loop. This is serious black magic but should work...
- Also it sets a flag internally to start allowing top-level await inside cells
You can use configuration, pass a command-line flag, etc., to preemptively switch into one of the async modes at startup

Of course there's a ways to go before we use async annotations everywhere like that. But we need to eventually reach a point of keeping the same loop alive over multiple cells, if we want this to be really useful. In any case, I think the basic idea of tracking whether we're in sync or async mode, and turning the magic parser on-or-off as appropriate, is a good one to expose to the user. And that's something that can be done now and would solve @dalejung's problem.

njsmith · 2018-08-22T07:54:34Z

...of course when writing the above I forgot about prompt-toolkit. Besides it needing some work to integrate with all these different loops, I'm not sure that it'll be happy switching between loops mid-stream...

Well, the architecture I described above ought to work for the kernel, or for jupyter console, at least :-). (With no GUI integration enabled.)

Carreau · 2018-08-27T17:21:37Z

Thanks ! Much appreciated.

Carreau · 2018-08-28T01:20:06Z

That would close #9166 as well.

Carreau · 2018-08-28T19:19:35Z

Todo, catch exception when the runner crash, EG, when using autoawait trio, and then await asyncio.sleep(0).

[EDIT]: Now done.

Make sure that if the coroutine runner encounter an exception (likely when encountering the wrong coroutine from another aio library), it is set on the result and does not crash the interpreter.

Carreau · 2018-08-31T18:57:39Z

Timeit, time, and prun magics will need updates to work with async code.
They still work for sync code though, so I don't think it is a blocker.

minrk · 2018-09-04T13:22:39Z

docs/source/whatsnew/pr/deprecations.rst

@@ -1,3 +1,6 @@
+Depreations


deprecations

Thanks, Fixed.

minrk · 2018-09-04T14:43:04Z

IPython/core/interactiveshell.py

+                    interactivity = 'async'
+                # yield interactivity so let run_cell decide whether to use
+                # an async loop_runner
+                yield interactivity


Adding yield interactivity here makes this a not-entirely-valid coroutine, doesn't it? When I try to call await run_cell_async from ipykernel, I get a bad yield: 'last_expr'. How can we communicate this required info without faking that this isn't actually a coroutine? Does it need to be an actual async generator?

Carreau · 2018-09-04T15:03:58Z

That's right. You need to do a small dance. I believe I have a patch on my machine for ipykernel to make this work. You need to advance the coro by sending None to it once. We could do it in another way, but at some point we'll always hit the fact that python does not have a real async-exec and that we need to distinguish 2 path of running sync code, or asyc one.

…

On Tue, Sep 4, 2018, 16:43 Min RK ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In IPython/core/interactiveshell.py <#11265 (comment)>: > @@ -2780,9 +2984,14 @@ def error_before_exec(value): self.displayhook.exec_result = result # Execute the user code - interactivity = 'none' if silent else self.ast_node_interactivity - has_raised = self.run_ast_nodes(code_ast.body, cell_name, - interactivity=interactivity, compiler=compiler, result=result) + interactivity = "none" if silent else self.ast_node_interactivity + if _run_async: + interactivity = 'async' + # yield interactivity so let run_cell decide whether to use + # an async loop_runner + yield interactivity Adding yield interactivity here makes this a not-entirely-valid coroutine, doesn't it? When I try to call await run_cell_async from ipykernel, I get a bad yield: 'last_expr'. How can we communicate this required info without faking that this isn't actually a coroutine? Does it need to be an actual async generator? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#11265 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUez6-l5irZuy9QnGMdamhrYJsfea77ks5uXpGXgaJpZM4V7qox> .

Carreau · 2018-09-07T11:13:28Z

Ok, seem like we've reached quasi static state and most of the latest updates were documentation. Plus ipykernel works with that. So I'm going to merge (thanks all involved !), and we can refine if necessary.

minrk · 2018-09-07T11:23:29Z

Fair enough. I'm just wondering if there's a better way to check if it should be async explicitly first, rather than relying on the fact that coroutines are actually just a special kind of generators, and having to call it in a special way that no other coro can be called.

minrk · 2018-09-07T11:45:09Z

#11289 makes run_cell_async a regular coroutine by moving the 'should it be async' check to a separate method.

Since in general, running it with a coroutine runner ought to work (I know there are edge cases for now), skipping this check should be safe.

@willingc

Alyssa Whitwell (3): Change signature to be imported from inspect library Add .python-version to gitignore Deprecate use of imp library, condense module_paths module to only one function, update tests Anatol Ulrich (1): fix #11082 - use dpaste.com, also remove py2 compatibility imports Benjamin Ragan-Kelley (19): upgrade pip on appveyor Merge pull request #11073 from Carreau/remove-io-meth Merge pull request #11072 from Carreau/remove-profile pretty-rendering for os.environ by default Merge pull request #11177 from takluyver/prompt-toolkit-2 Merge pull request #11185 from gpotter2/spec-missing Merge pull request #11172 from cedric05/master Merge pull request #11174 from Carreau/close-bg Merge pull request #11178 from toddrme2178/patch-1 Merge pull request #11250 from Carreau/invalid-escape-sequence Merge pull request #11278 from Carreau/cleanup-doctest make `run_cell_async` a regular coroutine exercise calling run_cell_async as a coroutine catch BaseException in coroutine runner Merge pull request #11287 from Carreau/bash-raise Merge pull request #11307 from Carreau/safe-input-transformer Merge pull request #11305 from Carreau/more-autoawait-docs Merge pull request #11311 from Carreau/rst-formatting Merge pull request #11301 from Carreau/cleanup-manifest Chaz Reid (1): Document -o flag for logstart magic Christoph (5): Disable qt inputhook backend when DISPLAY is not set on linux, because the qt lib does not handle this correct apply review comments type check also WAYLAND_DISPLAY apply comments Dale Jung (1): Only trigger async loop runner when needed. Allows running files that call async loops synchronously on their own. ipython/ipython#11265 Dave Hirschfeld (1): Allow specifying the name of the root element of a JSON display object Fernando Perez (1): Merge pull request #11107 from zichongkao/repr_doc Fred Mitchell (1): Create LICENSE Gabriel Potter (1): Fix autogen_shortcuts.py for prompt_toolkit 2.0 Grant Nestor (2): Drop jquery dependency in IPython.display.Javascript Take jquery's getScript approach Hugo (1): Drop support for Python 3.3 Jonathan Slenders (1): Upgrade to prompt_toolkit 2.0 Jörg Dietrich (2): Add ipython_tokens for syntax highlighting following cell magic add three tests for cell magic syntax highlighting Kyle Kelley (1): Merge pull request #11267 from gnestor/display-javascript M Pacer (1): create new --raise-error argument to raise an error if nonzero exitcode Matthew Seal (2): Added fix for display hook call output format Added missing imports for test Matthias Bussonnier (145): Remove Deprecation Warning, add since when things were deprecated. Merge pull request #10833 from takluyver/req-py34 remove some py3compat usage Fix readme: Quote to Codeblock Update LICENCE and Copying to match. ignore .editorconfig Remove deprecated profile line magic. Deprecate some methods from IPython.utils.io Merge pull request #10648 from srinivasreddy/srinivasreddy-patch-1 Merge pull request #11110 from takluyver/skip-jedi-omission-test Merge pull request #11109 from stonebig/patch-1 Merge pull request #11106 from takluyver/displayobjs-metadata Merge pull request #11101 from MSeal/captureHookFixPy3 What's new in 5.7 What's new in 6.4 Merge pull request #11119 from Carreau/wn64 Refactor of coloring and traceback mechanism. Traceback printing change `in <module>()` to `in <module>`. Some other cleaning of ultratb Remove import indirection and deprecated private function. Fix timeti test nightly/3.7 Update execution.py fix tests Leak less files during test. Fix test for Python 3.7+ test on 3.7 Merge pull request #11137 from joergdietrich/magic_highlighting Merge pull request #11131 from Carreau/fix-timeit-nightly Merge pull request #11135 from Carreau/fix-37 Merge pull request #11134 from Carreau/fix-fleaks Merge pull request #11129 from Carreau/cleanup Merge pull request #11127 from Carreau/clean-tb Merge pull request #11128 from Carreau/non-callable-module Some cleanup of Pycolorize. Merge pull request #11130 from Carreau/less-indir remove unsused utitlity function Merge pull request #11148 from Carreau/deprecated Bump Deprecation to 8.0, API has not stabilized. Autoclose stdin/err for bg scripts, when not assigned to user_ns Correctly tearDown some test cases with multiple inheritance. Swap base class instead of redefinign the tearDown method add docstring, and emit deprecation warnings Merge pull request #11211 from dhirschfeld/patch-2 Merge pull request #11192 from alphaCTzo7G/fix_typo_ipython_magic Merge pull request #11199 from mpacer/script_raise_error Merge pull request #11227 from yen223/11226-3-7-autocomplete-bugfix Upgrade pip before setuptools for Python compat. Switch protocol to https Merge pull request #11173 from Carreau/reswarn what's new in 6.5 fix release instructions Merge pull request #11245 from Carreau/fix-release-instructions Update version6.rst Merge pull request #11243 from Carreau/whatsnew65 Use raw string when invalid escape sequence present. Fix more escape sequences Merge pull request #11255 from alyssawhitwell/add-python-version-to-gitignore Merge pull request #11254 from alyssawhitwell/11206-signature-warning Merge pull request #11253 from parente/fix-ipynb Update deprecation warning message Merge pull request #11256 from alyssawhitwell/deprecate-imp-import Merge pull request #11251 from Carreau/deprecated-imports Prototype async REPL using IPython, take III fix UnboundLocalError titleto have doc build fix docs Load the asycn ext only on 3.5+ fix runnign on 3.7 remove duplicate WatsNew from bad rebase test with trio 3.7 still nto on travis reformat with black doc, remove appveyor 3.4 move infor to the right place DeprecationWarning runblack on new tests att triio runner at top level now that 3.4 drop + docs Add pseudo sync mode no f-strings docs cleanup, reformat code, remove dead code. remove trio from test requirement and skipp if not there fix test Merge pull request #11271 from luzpaz/misc-typo-and-whitespaces Test that using wrong runner/coroutine pair does not crash. run tests with trio and curio on travis Undeprecate autoindent Merge remote-tracking branch 'origin/master' into inputtransformer2 add notes some magic don't work yet Merge remote-tracking branch 'origin/master' into inputtransformer2 Actually run some tests. Merge pull request #11041 from takluyver/inputtransformer2 Remove Python 2 shim. Update test_ipdoctest.py Merge pull request #11277 from Carreau/map-is-lazy typo add tests test both old and new classes Add some extra metadata for PyPI (in the sidebar) remove unused utils function in setupbase.py Switch scripts cell magic default to raise if error happens. Merge pull request #11283 from oscar6echo/improve-autoreload Tool to go around sphinx limitation during developpement run doc fixing tool on travis Merge pull request #11288 from tkf/inputhook Merge pull request #11286 from Carreau/unused-utils-in-setupbase Merge pull request #11285 from Carreau/project_url Merge pull request #11265 from Carreau/async-repl-aug-2018 Start to updates the what's new / changelog. update release process fix comments build error on traivs Merge pull request #11289 from minrk/async-real-coroutine Add debug and fix build hopefully Merge pull request #11291 from minrk/catch-base-exception typos Merge pull request #10974 from boeddeker/master Merge pull request #11290 from Carreau/wn7 cleanup build process Remove include from MANIFEST Merge pull request #11304 from michael-k/python3.7 Merge pull request #11300 from luzpaz/misc-typos Revert 3.7 AST fix update docs about autoawait Add some inputtransformer test cases Some propose fixes. Better alternative; try each transformer in a row, fix Paul's comments one more rephrasing/plural one more plural Rst formatting (typo and decrease level to not be in sidebar) Fix magic directive and role. Update autoawait.rst Merge pull request #11308 from yarko/patch-1 Merge pull request #11313 from Carreau/fix-magic-directive update instructions: --pre apply to rc as well Merge pull request #11318 from blink1073/allow-setting-matchers Merge pull request #11315 from Carreau/instr-rc Fix the sphinx_ipython directive. Merge pull request #11321 from Carreau/fix-ipython-directive Merge pull request #11323 from hongshaoyang/patch-1 release 7.0.0rc1 back to development Prepare changelog for relese Update what's new and stats release 7.0.0 Michael Käufl (1): [travis] Run tests against Python 3.7 and a non-outdated nightly Paul Ganssle (5): Improve async detection mechanism with blacklist Add tests for SyntaxError with top-level return Fix indentation problem with _asyncify Fix async_helpers tests Refactor and tweak async-in-function tests Paul Ivanov (8): updated what's new fix typos, migrate latest to release notes add preliminary 7.0 release stats release 7.0.0b1 back to development Merge pull request #11299 from Carreau/cleanup-build-process Merge pull request #11162 from Carreau/revert-37-ast-fix minor typo and style tweak Peter Parente (1): Fix breaking newline Sourav Singh (1): Add deprecationwarning with stacklevel Srinivas Reddy Thatiparthy (1): remove deprecated variable - default_gui_banner Steven Silvester (1): Allow showing dict keys only Subhendu Ranjan Mishra (2): Fixes #11068 : Cleanup extra logic that handle python <=3.3 in IPython/core/extensions.py Issue #11068 : Cleanup extra logic that handle python <=3.3 in IPython/utils/openpy.py Takafumi Arakaki (1): Pass inputhook to prompt_toolkit Thomas A Caswell (1): FIX: Remove the non-interactive backends from pylabtools.backend2gui Thomas Kluyver (109): Working on new input transformation machinery Start adding tests for inputtransformer2 Add transformation for system assignments Factor out handling of line continuations Debugging function to see tokens Escaped commands Some more tests for escaped commands Transformations for 'help?' syntax Fix cell magic transformation More tests for line-based input transformers Start integrating new input transformation machinery into InteractiveShell Start adding code for checking when input is complete Start integrating new machinery for checking code completeness Fix fallback prompt & improve info on test failure Fix complete checking with space after backslash Ensure that result is defined in run_cell() Update test for new transformation API Document the new input transformation API Switch some references to input_splitter to input_transformer_manager Remove unused TerminalMagics.input_splitter Update sphinxext for new API Remove unused import Switch some imports from inputsplitter to inputtransformer2 Mark inputsplitter & inputtransformer as deprecated Switch inputtransformer2 back to stdlib tokenize module Drop bundled, outdated copy of the tokenize module Add shell.check_complete() method Convert syntax warnings to errors when checking code completeness This is an incompatible change Working on new input transformation machinery Start adding tests for inputtransformer2 Add transformation for system assignments Factor out handling of line continuations Debugging function to see tokens Escaped commands Some more tests for escaped commands Transformations for 'help?' syntax Fix cell magic transformation More tests for line-based input transformers Start integrating new input transformation machinery into InteractiveShell Start adding code for checking when input is complete Start integrating new machinery for checking code completeness Fix fallback prompt & improve info on test failure Fix complete checking with space after backslash Ensure that result is defined in run_cell() Update test for new transformation API Document the new input transformation API Switch some references to input_splitter to input_transformer_manager Remove unused TerminalMagics.input_splitter Update sphinxext for new API Remove unused import Switch some imports from inputsplitter to inputtransformer2 Mark inputsplitter & inputtransformer as deprecated Switch inputtransformer2 back to stdlib tokenize module Drop bundled, outdated copy of the tokenize module Add shell.check_complete() method Convert syntax warnings to errors when checking code completeness This is an incompatible change master branch is now 7.0 dev Add whatsnew development doc back to toc Drop support for Python 3.3 Bump up Python version on Appveyor too Simplify some pathlib imports Update error message in setup.py Update version numbers for Python support Merge pull request #11069 from minrk/upgrade-pip Tweak wording referring to LICENSE Merge pull request #11067 from Carreau/less-2-compat Merge pull request #11018 from souravsingh/add-cod Merge pull request #11071 from Carreau/rdm Merge pull request #10758 from fm75/master Disable Jedi completions by default Enable jedi for tests that apply to that Move where use_jedi is disabled again back in test Correct help string for config option Add changelog for 6.3.1 Merge pull request #11076 from takluyver/disable-jedi Merge pull request #11087 from tacaswell/fix_noninteractive_backends Merge pull request #11093 from subhrm/11068-B Merge pull request #11092 from subhrm/11068-A Display objects should emit metadata when it exists Comment out jedi parts of test_omit__names Merge pull request #11118 from Carreau/wn57 Merge pull request #11123 from luzpaz/fix-typos Merge pull request #11142 from Carreau/cleanup-pyc Merge pull request #11147 from charlesreid1/patch-1 Merge pull request #11156 from Carreau/completerdeprecationbump Merge branch 'inputtransformer2' of github.com:takluyver/ipython into inputtransformer2 Don't let parentheses level go below 0 Prevent infinite loops in input transformation Merge pull request #11164 from minrk/os-environ-pretty Arrange imports, add missing, remove unused Remove commented method Fix input rewrite prompt No newline after output prompt Merge pull request #11181 from apunisal/master Merge pull request #11182 from spookyvision/master Merge pull request #11190 from infmagic2047/fix-completion-style Simpler mechanism to extend input transformations Merge branch 'master' into inputtransformer2 Fix generating shortcuts docs Shortcut to transform_cell in magics code Update tests for input transformer raising SyntaxError Update transformer test in terminal test case Add & improve docstrings following @willingc's review Reformat for readability Add description of priority system Merge pull request #11235 from Carreau/https Merge pull request #11234 from Carreau/pip-first Todd (1): Include LICENSE file in wheels Wei Yen (3): Add regression test Ensure `try_import` does not fail on null module.__file__ Reset sys.path after test Yarko Tymciurak (1): update documentation to add beta install instructions Yutao Yuan (1): Fix config option TerminalInteractiveShell.display_completions Zi Chong Kao (2): Document that _repr_*_() can return metadata Document that _repr_*_() can return metadata alphaCTzo7G (1): Fixes default value of -r<R> and updates documentation apunisal (1): Changed a misspelled word in tools/git-mpr.py dhirschf (2): Update test_json to account for new metadata Update .gitignore gpotter2 (1): Add __spec__ to DummyMod hongshaoyang (1): Minor edits to magics doc luz.paz (4): Fix documentation typos Misc. typo fixes Whitespace fixes typos meeseeksdev[bot] (1): Merge pull request #11273 from Carreau/re-autoindent oscar6echo (3): Add new methods in update_class() Fix inconsequential typo in test Add file in whatsnew/pr prasanth (1): checking weather virtualenv dir exists or not stonebig (1): https for all readthedocs.io links

Carreau added 2 commits August 13, 2018 18:46

fix UnboundLocalError

9f21667

Carreau mentioned this pull request Aug 14, 2018

[WIP] async repl continuation #11155

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Carreau added 4 commits August 13, 2018 21:02

titleto have doc build

c5b1e05

fix docs

05789e8

Load the asycn ext only on 3.5+

4fac0cb

fix runnign on 3.7

5ea200e

Carreau mentioned this pull request Aug 14, 2018

Can't invoke asyncio event_loop after tornado 5.0 update jupyter/notebook#3397

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minrk reviewed Aug 16, 2018

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Carreau added this to the 7.0 milestone Aug 16, 2018

remove duplicate WatsNew from bad rebase

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Usecase for nested run (and blocking outside runer) python-trio/trio#608

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Carreau added 10 commits August 16, 2018 11:56

test with trio

702b946

3.7 still nto on travis

c447030

reformat with black

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doc, remove appveyor 3.4

390bb17

move infor to the right place

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DeprecationWarning

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runblack on new tests

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att triio runner at top level now that 3.4 drop + docs

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Add pseudo sync mode

2b7f067

no f-strings

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dalejung added a commit to dalejung/ipython that referenced this pull request Aug 21, 2018

Only trigger async loop runner when needed. Allows running files that

ed811bd

call async loops synchronously on their own. ipython#11265

Only trigger async loop runner when needed. Allows running files that

8d38b3c

call async loops synchronously on their own. ipython#11265 Handle early return conditions from coro

Carreau added 3 commits August 27, 2018 14:49

docs cleanup, reformat code, remove dead code.

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remove trio from test requirement and skipp if not there

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fix test

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Carreau mentioned this pull request Aug 28, 2018

Add an option to run an asyncio event loop automatically #9166

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Carreau mentioned this pull request Aug 28, 2018

async support ipython/ipykernel#323

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Carreau added 2 commits August 28, 2018 15:06

Test that using wrong runner/coroutine pair does not crash.

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Make sure that if the coroutine runner encounter an exception (likely when encountering the wrong coroutine from another aio library), it is set on the result and does not crash the interpreter.

run tests with trio and curio on travis

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add notes some magic don't work yet

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minrk reviewed Sep 4, 2018

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typo

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minrk reviewed Sep 4, 2018

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Tool to go around sphinx limitation during developpement

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Carreau force-pushed the async-repl-aug-2018 branch from 3156d6d to 85db703 Compare September 6, 2018 20:23

run doc fixing tool on travis

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Carreau merged commit 0acd580 into ipython:master Sep 7, 2018

Carreau deleted the async-repl-aug-2018 branch September 7, 2018 11:13

minrk mentioned this pull request Sep 7, 2018

Make run_cell_async a real coroutine #11289

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Carreau mentioned this pull request Oct 1, 2018

async-detection: nonlocal does not raise syntaxerror #11312

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topherocity mentioned this pull request Dec 10, 2018

Colored prompt for embed() #11523

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Carreau added the async/await label Mar 25, 2019

mehaase mentioned this pull request Jul 17, 2019

Keep async event loop alive between cells #11829

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