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Block on result of `async` method within a normal (sync) method
2019 Community Moderator ElectionTest if function or method is normal or asynchronousSet result of 2 or more Async HTTP calls into named variablesUsing async/await keywords with Tk.after() method of tkinterPython websockets: how to override sync method WebSocketCommonProtocol.connection_made() with async call?async code running synchronously, doesn't seem to have any lines that will be blockingasyncio: collecting results from an async function in an executorTypeError: _request() got an unexpected keyword argument 'cookies' (aiohttp)check if function is async in python 3.7Wait on an ordinary function which calls an async functionCan a Python coroutine be implemented without await or yield?
Say I have an async 'core' in my algorithm that is meant to return a final result.
And some sync parts that have to run before and after. Like:
async def algo_async(x):
await ...
return result
def run():
x = prepare()
r = ???(algo_async(x)) #< What here?
post(r)
python-3.x python-asyncio
asked Mar 7 at 10:41
NarfanarNarfanar
177211
add a comment |
Say I have an async 'core' in my algorithm that is meant to return a final result.
And some sync parts that have to run before and after. Like:
async def algo_async(x):
await ...
return result
def run():
x = prepare()
r = ???(algo_async(x)) #< What here?
post(r)
python-3.x python-asyncio
asked Mar 7 at 10:41
NarfanarNarfanar
177211
add a comment |
Say I have an async 'core' in my algorithm that is meant to return a final result.
And some sync parts that have to run before and after. Like:
async def algo_async(x):
await ...
return result
def run():
x = prepare()
r = ???(algo_async(x)) #< What here?
post(r)
python-3.x python-asyncio
asked Mar 7 at 10:41
NarfanarNarfanar
177211
Say I have an async 'core' in my algorithm that is meant to return a final result.
And some sync parts that have to run before and after. Like:
async def algo_async(x):
await ...
return result
def run():
x = prepare()
r = ???(algo_async(x)) #< What here?
post(r)
python-3.x python-asyncio
python-3.x python-asyncio
asked Mar 7 at 10:41
NarfanarNarfanar
177211
asked Mar 7 at 10:41
NarfanarNarfanar
177211
asked Mar 7 at 10:41
NarfanarNarfanar
177211
asked Mar 7 at 10:41
NarfanarNarfanar
177211
asked Mar 7 at 10:41
NarfanarNarfanar
177211
177211
add a comment |
add a comment |
1 Answer
1
active
oldest
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Async function can be (and should be) runned by event loop, for example:
def run():
x = prepare()
r = asyncio.run(algo_async(x))
post(r)
(If you have Python < 3.7 use asyncio.get_event_loop().run_until_complete(algo_async(x)) instead of asyncio.run)
Note, however, that main reason to make function async in the first place is an ability to run it concurrently with other async functions. When you run async function inside synchronous function, you lose this ability and all related benefits.
That's why usually people make event loop running entry point of whole program and use make all functions that need to run async function async also.
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making themainfunction itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!
– Narfanar
Mar 7 at 13:43
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
add a comment |
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1 Answer
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oldest
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oldest
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active
oldest
votes
Async function can be (and should be) runned by event loop, for example:
def run():
x = prepare()
r = asyncio.run(algo_async(x))
post(r)
(If you have Python < 3.7 use asyncio.get_event_loop().run_until_complete(algo_async(x)) instead of asyncio.run)
Note, however, that main reason to make function async in the first place is an ability to run it concurrently with other async functions. When you run async function inside synchronous function, you lose this ability and all related benefits.
That's why usually people make event loop running entry point of whole program and use make all functions that need to run async function async also.
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making themainfunction itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!
– Narfanar
Mar 7 at 13:43
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
add a comment |
Async function can be (and should be) runned by event loop, for example:
def run():
x = prepare()
r = asyncio.run(algo_async(x))
post(r)
(If you have Python < 3.7 use asyncio.get_event_loop().run_until_complete(algo_async(x)) instead of asyncio.run)
Note, however, that main reason to make function async in the first place is an ability to run it concurrently with other async functions. When you run async function inside synchronous function, you lose this ability and all related benefits.
That's why usually people make event loop running entry point of whole program and use make all functions that need to run async function async also.
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making themainfunction itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!
– Narfanar
Mar 7 at 13:43
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
add a comment |
Async function can be (and should be) runned by event loop, for example:
def run():
x = prepare()
r = asyncio.run(algo_async(x))
post(r)
(If you have Python < 3.7 use asyncio.get_event_loop().run_until_complete(algo_async(x)) instead of asyncio.run)
Note, however, that main reason to make function async in the first place is an ability to run it concurrently with other async functions. When you run async function inside synchronous function, you lose this ability and all related benefits.
That's why usually people make event loop running entry point of whole program and use make all functions that need to run async function async also.
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
Async function can be (and should be) runned by event loop, for example:
def run():
x = prepare()
r = asyncio.run(algo_async(x))
post(r)
(If you have Python < 3.7 use asyncio.get_event_loop().run_until_complete(algo_async(x)) instead of asyncio.run)
Note, however, that main reason to make function async in the first place is an ability to run it concurrently with other async functions. When you run async function inside synchronous function, you lose this ability and all related benefits.
That's why usually people make event loop running entry point of whole program and use make all functions that need to run async function async also.
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
answered Mar 7 at 11:01
Mikhail GerasimovMikhail Gerasimov
14.2k43869
14.2k43869
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making themainfunction itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!
– Narfanar
Mar 7 at 13:43
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
add a comment |
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making themainfunction itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!
– Narfanar
Mar 7 at 13:43
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making the
main function itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!– Narfanar
Mar 7 at 13:43
For the note: consider that the async algo itself runs several things concurrently. My whole issue is with explicitly sequencing part of the pipeline, while not making the
main function itself async (because I can't). Your solution is simple, and does work in a script, but I can't get it to work in a Jupyter environment (using IPython 7.x, which seems to react weirdly to async code?). Any help appreciated!– Narfanar
Mar 7 at 13:43
1
1
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
@Narfanar in case problem you have is "asyncio.run() cannot be called from a running event loop" it is discussed here. Solution from this comment solved issue for me: i.imgur.com/oTpuaRu.png
– Mikhail Gerasimov
Mar 7 at 14:06
add a comment |
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