[Matplotlib-users] matplotlib interactive in a shell terminal?

Wed May 20 10:31:19 EDT 2020

The issue you are having is that you need integrate the two event loop (the
prompt and the GUI) in a way that they will time share.  Please see
https://github.com/matplotlib/matplotlib/pull/4779 (which hopefully we can
get merged soon so I can start linking people to the docs rather than a PR)
for details.

The reason that it works in IDLE is that IDLE sets up the hooks to
integrate Python prompt and Tk event loop.

The IPython magics let you select which GUI event loop you would like to
integrate with the terminal.

Similarly, someplace inside wxmplot the input hook is being set up for Wx
(either implicitly or explicitly).

To get this working inside of puredata you should reach out to them and ask
about how to talk to their GUI from Python and then make sure that you use
the backend that matches that framework.  From a very very cursory glance
at their website it looks like they have a GUI application with a captive
python interpreter so I suspect if you can create a window in the correct
toolkit, it will work (because the thing _outside_ of the Python prompt is
already running the GUI).

Tom

On Mon, May 18, 2020 at 7:12 PM Raphael Raccuia <
rafael.raccuia at blindekinder.com> wrote:

> Ah, ok I get it. I'll give a try.
> Puredata is a visual programming languate: http://puredata.info/, which
> has a lib to bind with Python 2.7.
> It's related to my first question cause in both cases it doesn't display.
> So simply why does it work in Idle, but not in PD and shell?
>
> rph
>
> Le 19.05.20 à 01:04, Matt Newville a écrit :
>
> Hi Raphael,
>
> Sorry, I have no idea what Puredata is.  I thought your question was about "linux
> shell terminal".
>
> Wxmplot is not another language, it is a simple python module with
> functions called `plot()`, `imshow()`, and a few other functions for extra
> tools.   It's not magic (and doesn't require any of the silly IPython
> "magic").  From a usage point of view, I think it could not be much
> simpler: it does not need `ion()` or `show()`.  Just `plot()`.
>
> But, maybe you're looking for something else.
> Cheers,
>
>
> On Mon, May 18, 2020 at 5:04 PM Raphael Raccuia <
> rafael.raccuia at blindekinder.com> wrote:
>
>> Thank you Matt,
>>
>> since the visual of my plot is almost finished and nice, I'm not sure
>> I'll learn another language at the moment.
>>
>> Anyway, I fixed my script to work with P2.7, and learned how to use
>> Puredata [pyext] object, but now I have the following issue, related to the
>> initial one:
>>
>> plt.ion()
>> plt.plot([1, 2, 3, 4], [1, 4, 2, 3])
>> plt.show(block=True)
>>
>> The plot is interactive, PD sends instructions to Python to fill and
>> modify. If *block* = *True*, it displays the plot in Tk window, but
>> since it's blocked, PD doesn't respond until I close the window.
>> If *block* = *False*, Tk window appear, empty, and impossible to close,
>> but PD remains functional.
>>
>> any idea how to fix that?
>> rph
>>
>> Le 18.05.20 à 15:59, Matt Newville a écrit :
>>
>> Raphael,
>>
>> Depending on your needs, you might find wxmplot useful.  This supports
>> non-blocking, interactive 2D plots and image display from a terminal
>> Python or IPython session.  As the name might imply, it requires wxPython
>> but is installed with `pip install wxmplot` if your Linux Python has
>> wxPython available (Anaconda Python does).  With this installed, you can do
>>
>>     >>> import numpy as np
>>     >>> import wxmplot.interactive as wi
>>     >>> x = np.linspace(0, 20, 101)
>>     >>> wi.plot(x, np.sin(x), xlabel='t (s)')
>>    <wxmplot.interactive.PlotDisplay at 0x10db88678>
>>     >>> wi.plot(x, np.cos(x)*np.exp(-x/10))
>>    <wxmplot.interactive.PlotDisplay at 0x10db88678>
>>
>> The first plot() there will show an interactive display of the plot and
>> return the prompt.  The second plot() here add the trace on top of the
>> first (you can add optional arguments to open a second plot window or draw
>> to right-hand axes).  The plot windows have drag-and-zoom and many
>> configuration options for colors, themes, etc available after the plot has
>> been displayed.  There is also a `wxmpot.interactive.imshow()` to show an
>> interactive false-color image of 2D data.   See
>> https://newville.github.io/wxmplot/interactive.html for more details.
>>
>> Of course, these do not do everything available in matplotlib, but if you
>> are doing basic 2D line plots or image display they should go a long way.
>> And you can grab that return value and its `PlotDisplay.panel.axes` (a
>> matplotlib Axes) and `PlotDisplay.panel.fig` (a matplotib Figure) if you
>> want to do more complicated things.
>>
>> --Matt
>>
>> On Mon, May 18, 2020 at 3:43 AM Raphael Raccuia <
>> rafael.raccuia at blindekinder.com> wrote:
>>
>>> Hi,
>>> Any chance  to use matplotlib in a linux shell terminal?
>>>
>>> if I make 'python3 my/script.py', it displays the plot but I have no
>>> prompt >>>.
>>> It works in Idle.
>>> That would be my test script:
>>>
>>> #!/usr/bin/env python3 #otherwise loads a 'ghost': cursor turn to cross,
>>> but no window.
>>>
>>> import matplotlib
>>> print(matplotlib.get_backend()) #print TkAgg in the terminal
>>>
>>> import matplotlib.pyplot as plt
>>>
>>> plt.ion()
>>>
>>>
>>> plt.plot([1, 2, 3, 4], [1, 4, 2, 3])
>>>
>>> plt.show(block=True) #block=True: othewise it close immediately plot and
>>> terminal
>>>
>>> thank you!
>>>
>>> rph-r
>>>
>>>
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>>> Matplotlib-users mailing list
>>> Matplotlib-users at python.org
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>>
>>
>>
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>
>
> --
> --Matt Newville <newville at cars.uchicago.edu> 630-252-0431
>
>
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-- 
Thomas Caswell
tcaswell at gmail.com
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