ipython/ipython

Talking about cool IPython features!

evidlo

@Evidlo:matrix.org

A few months ago I work on a plugin for supporting 'cells' in a regular .py file

I was hoping somebody might give input or comment on its usefulness: https://github.com/UIUC-SINE/ipython-cells

onus tepolov

@blastoporeus_twitter

can %run accept a variable as a file name? I can't seem to get it to work. eg) %run '/some/path/file.ipynb' works, but if I have target = 'some/path/file.ipynb' then %run target, it says ERROR:root:File 'target.py' not found.

Min RK

@minrk

@blastoporeus_twitter try %run $target to get variable expansion

1 reply

nbuntrust

@nbuntrust

Is there any way to gain access to the SingleUserNotebookApp data from an ipython extension?

nbuntrust

@nbuntrust

Right now I'm parsing syslog data on the fly to get the IP of the connected user, but of course if SingleUserNotebookApp is writing it into a log, it knows it somewhere that I would think I could access more efficiently... :-)

Nicholas Bollweg

@bollwyvl

they are in different processes. you can talk to the API like any other client, however.

nbuntrust

@nbuntrust

This API is documented somewhere? I guess that's what I'm trying to find

siddharth99

@siddharth99

Hi, I am running into an error with cython code and the jupyter kernel ends up restarting itself.. I don't see where the actual error happens, don't see a core file and not sure how to debug further

[I 13:59:36.224 NotebookApp] KernelRestarter: restarting kernel (1/5), keep random ports
kernel b4f40812-cf7d-4f97-925b-84780f946bc9 restarted

anyone has any suggestions?

1 reply

pritimanbala

@pritimanbala

hii

there

there is a problem that i am running code in the for loop of python and now I cant configure it out that how can I run my loop in the cmd of my pc

wraptile

@wraptile:matrix.org

[m]

Hello, can I embed ipython in an async program? can't seem to find any docs on it. I've tried:

    import nest_asyncio
    nest_asyncio.apply()
    IPython.embed(using='asyncio')

with no luck 😐️

Thomas A Caswell

@tacaswell

On a very new version of everything (CPython, traitlets, and IPython) I'm seeing AttributeError: 'Namespace' object has no attribute '_flags' when starting with ipython --simple-prompt. Has anyone else seen this or have hints of where to start looking?
`

Thomas A Caswell

@tacaswell

Looks like this is a change it CPython :/

Min RK

@minrk

@tacaswell 3.10 or 3.9?

Min RK

@minrk

Ah, I see it. Merged, thanks!

Thomas A Caswell

@tacaswell

Thanks @minrk !

Cassiel-girl

@Cassiel-girl

When I enter ipython, I enter python code and the result is returned. Which function can realize that the input parameter is Python code and the result of function execution is similar to the result of ipython after executing that python code?

Cassiel-girl

@Cassiel-girl

An ipython backend is running on one machine A. This backend receives commands from a user on another machine B, sends them to A for execution, and then returns the results to B. The program running on the other machine B is a pyqt5 GUI that can type strings, but machine B cannot install anything ipython related. What programming interface should the program on machine A call to implement? Or an example of the relevant code.

Min RK

@minrk

That's potentically a big task, but the main core function for evaluating code is exec. What 'results' might be is tricky for exec.

IPython's implementation is mostly here but it has lots of handling of different async situations that you probably don't need. Other things to consider include a persistent namespace or not, etc.

Jerry Johns

@mrjerryjohns

Hello! I'm seeing an issue with my IPython setup on Mac, where attempting to use await with an async command results in the following error:

    648 
    649         if self._local._loop is None:
--> 650             raise RuntimeError('There is no current event loop in thread %r.'
    651                                % threading.current_thread().name)
    652 

RuntimeError: There is no current event loop in thread 'MainThread'.

I've traced it to the fact that the following call always errors out:

import asyncio
asyncio.get_event_loop()

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-6-6908e23590ee> in <module>
----> 1 asyncio.get_event_loop()

/usr/local/Cellar/python@3.9/3.9.7_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/events.py in get_event_loop(self)
    648 
    649         if self._local._loop is None:
--> 650             raise RuntimeError('There is no current event loop in thread %r.'
    651                                % threading.current_thread().name)
    652 

RuntimeError: There is no current event loop in thread 'MainThread'.

Extensive search of stack-overflow didn't yield any answers unfortunately :(

Min RK

@minrk

@mrjerryjohns what's your IPython version? I wouldn't expect that on recent IPython.

Jerry Johns

@mrjerryjohns

Python 3.9.7, IPython 7.30.0.

Reproducible test case:

Python 3.9.7 (default, Oct 13 2021, 06:45:31) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.30.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: async def ping():
   ...:     pass
   ...: 

In [2]: 

In [2]: await ping()
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
/usr/local/lib/python3.9/site-packages/IPython/core/async_helpers.py in __call__(self, coro)
     26         import asyncio
     27 
---> 28         return asyncio.get_event_loop().run_until_complete(coro)
     29 
     30     def __str__(self):

/usr/local/Cellar/python@3.9/3.9.7_1/Frameworks/Python.framework/Versions/3.9/lib/python3.9/asyncio/events.py in get_event_loop(self)
    644 
    645         if self._local._loop is None:
--> 646             raise RuntimeError('There is no current event loop in thread %r.'
    647                                % threading.current_thread().name)
    648 

RuntimeError: There is no current event loop in thread 'MainThread'.

In [2]:

9 replies

Michał Krassowski

@krassowski

What is IPython display equivalent of print(something, file=sys.stderr)? Like tracebacks for extensions get printed out on red background, I would have thought there is a 1-1 utility for displaying rich-formatted warnings/errors other than exceptions - is there one?

Min RK

@minrk

There isn't a stderr-equivalent for display. Just one display channel.

It could be reasonable to define a metadata field for this use case

Maxime Liquet

@maximlt

Hi all! Running publish_display_data(data={'application/javascript': 'console.log(1)'}) in a notebook cell creates an output with an empty div that is displayed (height of 12.23px). Is there a way to hide such output from IPython's API?

5 replies

Cassiel-girl

@Cassiel-girl

how to know the data layout of data type in memory?

aplund

@aplund:matrix.org

[m]

How do I enter mutiple expressions at once? I've tried shift-enter and ctrl-o enter, and neither work for me. I'm using the 'vi' editing_mode.

dxaw2004

@dxaw2004

is Ipython doesn't support
warnings.simplefilter('once', RuntimeWarning)

import warnings
warnings.simplefilter('once', RuntimeWarning)
def x():
warnings.warn('xx', RuntimeWarning)
x()
C:\Program Files (x86)\Python37-32\Scripts\ipython:2: RuntimeWarning: xx
x()
C:\Program Files (x86)\Python37-32\Scripts\ipython:2: RuntimeWarning: xx

I expect the warning just show once, i try the same code with python, it work as expect. what's wrong here?

Charles Ojemen

@ojemen_charles_twitter

Hhhsms

Ganomee

@Ganomee

Hello, does anyone of you know of a way, to store the output of the %store command into a variable inside a notebook? While %store produces a printed output, I cannot seem to get its output into a list form [a,b] if the store contains variables a and b.

1 reply

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