Using Dash library for python

[gilles....@gmail.com]

Hello

I would like to use Dash lib in a python chart.

I created a python chart containing the example code in https://dash.plotly.com/dash-core-components/input

Unfortunately, Dash is not available... How can I overcome this issue ?

Thanks in advance

Regards

Gilles

[Ale Martinez]

El lunes, 16 de octubre de 2023 a la(s) 13:16:28 UTC-3, gilles....@gmail.com escribió:

Hello

I would like to use Dash lib in a python chart.

I created a python chart containing the example code in https://dash.plotly.com/dash-core-components/input

Unfortunately, Dash is not available... How can I overcome this issue ?

To install Python packages see the Working with Python entry in the wiki, for Dash see also  https://groups.google.com/g/golden-cheetah-users/c/nNyKZc15VrA/m/o9s0X6J1AwAJ

[gilles....@gmail.com]

Thanks, I installed dash in some python 3.7 environment using miniconda, and I set the option > General > Python home to "c:\gilles\programs\miniconda3\envs\freecad37\"

Unfortunately, dash module is still not found.

[Ale Martinez]

El lunes, 16 de octubre de 2023 a la(s) 16:47:13 UTC-3, gilles....@gmail.com escribió:

Thanks, I installed dash in some python 3.7 environment using miniconda, and I set the option > General > Python home to "c:\gilles\programs\miniconda3\envs\freecad37\"

Not sure about miniconda environments, but standard Python ones (venv, virtualenv) don't work with Python embedding as used by GoldenCheetah. 

[Ale Martinez]

BTW, all of the above and basically all we know about the Python chart is documented in https://github.com/GoldenCheetah/GoldenCheetah/wiki/UG_Special-Topics_Working-with-Python#using-the-python-chart, I strongly suggest to carefully read that document if you plan to use a separate Python install. 

[gilles....@gmail.com]

Thanks

I did another installation of Python, with many difficulties... I have several python packages that I do not know how to choose among them  with c:\Windows\py.exe

I installed 3.7.9 64 bits version from web installer (to C:\Users\xxx\AppData\Local\Programs\Python\Python37 )

Then I installed pip from command line : C:\Users\xxx\AppData\Local\Programs\Python\Python37\python.exe c:\gilles\bin\get-pip.py

Then I installed dash with :  run  C:\Users\xxx\AppData\Local\Programs\Python\Python37\python.exe -m pip install dash

Then I changed the GC Python interpreter in Options > General

The code still does not Work : "import dash" works, but the code ends with error 

from dash import Dash, dcc, html, Input, Output, callback

app = Dash(__name__) ALLOWED_TYPES = ( "text", "number", "password", "email", "search", "tel", "url", "range", "hidden", ) app.layout = html.Div( [ dcc.Input( id="input_{}".format(_), type=_, placeholder="input type {}".format(_), ) for _ in ALLOWED_TYPES ] + [html.Div(id="out-all-types")] ) @callback( Output("out-all-types", "children"), [Input("input_{}".format(_), "value") for _ in ALLOWED_TYPES], ) def cb_render(*vals): return " | ".join((str(val) for val in vals if val)) if __name__ == "__main__": app.run(debug=True)

[Ale Martinez]

El martes, 17 de octubre de 2023 a la(s) 11:32:05 UTC-3, gilles....@gmail.com escribió:

Thanks

I did another installation of Python, with many difficulties... I have several python packages that I do not know how to choose among them  with c:\Windows\py.exe

I installed 3.7.9 64 bits version from web installer (to C:\Users\xxx\AppData\Local\Programs\Python\Python37 )

Then I installed pip from command line : C:\Users\xxx\AppData\Local\Programs\Python\Python37\python.exe c:\gilles\bin\get-pip.py

Then I installed dash with :  run  C:\Users\xxx\AppData\Local\Programs\Python\Python37\python.exe -m pip install dash

Then I changed the GC Python interpreter in Options > General

The code still does not Work : "import dash" works, but the code ends with error 

Since the example you are testing doesn't use the GC api you could try running it directly from the Python interpreter to debug your install independently of GC before trying the embedding.

[gilles....@gmail.com]

I run this example with the Python installation, using the command "python c:\gilles\dcc_input_example.py".

It works, dash server gives access to the expected web page.

Here follows a screen capture:

[Ale Martinez]

El miércoles, 18 de octubre de 2023 a la(s) 04:36:34 UTC-3, gilles....@gmail.com escribió:

I run this example with the Python installation, using the command "python c:\gilles\dcc_input_example.py".

It works, dash server gives access to the expected web page.

GFY, then you can point GC to that Python instance and try again, if you see an error in the console you can go to the reported file/line to try to understand what is happening.

[Mark Liversedge]

It might be worth adding a note to the wiki that calls made from a Python script must not block (eg. start a server, wait for user input)

[Ale Martinez]

El jueves, 19 de octubre de 2023 a la(s) 12:58:23 UTC-3, Mark Liversedge escribió:

It might be worth adding a note to the wiki that calls made from a Python script must not block (eg. start a server, wait for user input)

Agree and I will do it.

Dash used to work using Python threading module to start the server as illustrated by the chart example included in the conversation I linked in my first answer, but current version seems to be failing when the Dash object is instantiated -well before the server is started- likely due to introspection on the calling stack, but I have not tested myself.

[gilles....@gmail.com]

When GC points to this installation, the python chart generates the error :

Mark & Ale : indeed, the dash/python script starts a server... 

My idea is to use dash to implement a user input that represent the name of a segment (combo box selection, or text input) connected to an event which updates the chart of segment's power & duration timeline...

Regards

[Remco Boerwinkel]

Hi Gilles,

First i must say i have not updated to the latest GC so not sure if things are the same with python and treading. I'm running on an older build:

My experience with dash in combination with GC is that it is tricky with treading indeed as Mark and Ale said . Also when other charts/dash pages are loaded after a dash server has been started.

In my script I try to kill other dash instances before starting a new one. An example you can try is uploaded: 

Hope this helps, and of course try on your own risk 🤞

Kind regards,

Remco

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[Ale Martinez]

El viernes, 20 de octubre de 2023 a la(s) 12:21:30 UTC-3, Remco Boerwinkel escribió:

Hi Gilles,

First i must say i have not updated to the latest GC so not sure if things are the same with python and treading. I'm running on an older build:

Hi Remco, I think the problem the OP is reporting is not related to GC build but to Dash version, which Dash version works for you? 

[Ale Martinez]

El viernes, 20 de octubre de 2023 a la(s) 11:47:12 UTC-3, gilles....@gmail.com escribió:

When GC points to this installation, the python chart generates the error :

Have you checked the code where the error happens?

Mark & Ale : indeed, the dash/python script starts a server... 

My idea is to use dash to implement a user input that represent the name of a segment (combo box selection, or text input) connected to an event which updates the chart of segment's power & duration timeline...

An alternative could be to plot all available segments and use Plotly interactive features to drill down or select the one you are interested. 

[Ale Martinez]

I found the failing introspection was added in latest release: https://github.com/plotly/dash/commit/a83c5b3087a2b74de2a0b3cf7b1a67260ae5f97f, your example works using the previous version (dash==2.13.0)

[marcen]

Hi Gilles,

I don't know if I understood correctly what you are trying to do.

There is a chart available for selected segment with power, duration and more metrics:
https://groups.google.com/g/golden-cheetah-users/c/7kJ0tCIHnyo/m/D4sTKysCDAAJ

[gilles....@gmail.com]

Thank you for your answers !

Ale : I rolled back dash module to previous version " (dash==2.13.0)". Unfortunately, there is some trouble :

- when python interpreter is run from an external console, everything is correct :

>>> import dash

>>> dash.__version__
'2.13.0'

C:\Users\xxx\AppData\Local\Programs\Python\Python37>python.exe c:\gilles\dcc_input_example.py
Dash is running on http://127.0.0.1:8050/

 * Serving Flask app 'dcc_input_example'
 * Debug mode: on

- in GC, dash is not found anymore : "No module named "dash"

marcen : thank you very much for letting me discover "leaderboard.py" python chart ! 

This is almost everything that I wanted.

I've tested it since last monday...

Best regards

[Joachim Kohlhammer]

Hi Gilles,

gilles....@gmail.com schrieb am Donnerstag, 26. Oktober 2023 um 15:51:15 UTC+2:

marcen : thank you very much for letting me discover "leaderboard.py" python chart ! 

This is almost everything that I wanted.

I've tested it since last monday...

Nice to hear that you like my script. I have put it in a github repo (https://github.com/thejockl/goldencharts), maybe we can extend it to fully meet your needs - always open for new ideas

Regards

 Joachim