How to import modules into Brython

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Vitali Coltuclu

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Dec 5, 2014, 1:38:40 PM12/5/14
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Hello Everyone,

I am trying to import into Brython a module (pubchempy) that I installed on my Linux system using pip. I receive the following errors:

"Error 404 means that Python module pubchempy was not found at url http://127.0.0.1:5000/static/js/brython/Lib/site-packages/pubchempy.py" brython.js:7264
"Error 404 means that Python module pubchempy was not found at url http://127.0.0.1:5000/static/js/brython/Lib/site-packages/pubchempy/__init__.py" brython.js:7264

"Error 404 means that Python module __future__ was not found at url http://127.0.0.1:5000/static/js/brython/Lib/site-packages/__future__.py" brython.js:7264
"Error 404 means that Python module __future__ was not found at url http://127.0.0.1:5000/static/js/brython/Lib/site-packages/__future__/__init__.py" brython.js:7264

The actual list of "module was not found" is long. I just included first two samples. Then, I placed pubchempy.py and __future__.py modules in static/js/brython/Lib/site-packages folder and the errors above are gone. So I am wondering if there is a simpler way of importing modules into Brython.

Thanks for your time,
Vitali

Christophe Bal

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Dec 5, 2014, 2:01:18 PM12/5/14
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Hello.

How do you do that ?


Christophe BAL
Enseignant de mathématiques en Lycée et développeur Python amateur
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French math teacher in a "Lycée" and amateur developer in Python

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Olemis Lang

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Dec 5, 2014, 2:05:47 PM12/5/14
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On Fri, Dec 5, 2014 at 1:38 PM, Vitali Coltuclu <rus...@gmail.com> wrote:

Hello Everyone,


Hi !
:)
 
I am trying to import into Brython a module (pubchempy) that I installed on my Linux system using pip. I receive the following errors:


The attempt is made to load your module by looking up source code in Brython site-packages folder , hence not found ...


The actual list of "module was not found" is long. I just included first two samples. Then, I placed pubchempy.py and __future__.py modules in static/js/brython/Lib/site-packages folder and the errors above are gone. So I am wondering if there is a simpler way of importing modules into Brython.



This is a very common question in the forums . The answer is to do something like this 

{{{#!html

<body onload="brython({debug:1, pythonpath:['src/python']})">
}}}

Provided that your module may be downloaded from src/python sub-path by issuing HTTP GET requests .

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Vitali Coltuclu

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Dec 5, 2014, 2:13:46 PM12/5/14
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Hello Christophe,

Do you mean how I import the module? I have a main.py file which is loaded by Brython. Here are my imports:

from browser import document as doc, alert, window
from browser import ajax
import pubchempy as pcp
import json

Thanks,
Vitali

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André

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Dec 5, 2014, 2:57:26 PM12/5/14
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On Friday, 5 December 2014 14:38:40 UTC-4, Vitali Coltuclu wrote:
 
The actual list of "module was not found" is long. I just included first two samples. Then, I placed pubchempy.py and __future__.py modules in static/js/brython/Lib/site-packages folder and the errors above are gone. So I am wondering if there is a simpler way of importing modules into Brython.

Like any modules, on any computers, to import a module using Python, that module needs to be in a known path (listed in sys.path). When you install a module on your computer using pip, pip puts that module in a standard location in your Python distribution.  Brython is a separate implementation of Python and it is located in a completely different location.  At this moment, there does not exist an equivalent to pip (bip?) for Brython.  So, you must move or copy the files by yourself in a location known by Brython as a place from where it can import files.   This is what you did (correctly) when you put them in static/js/brython/Lib/site-packages.  You'll have to do the same for all other modules which you intend to import from Brython.

André

Kiko

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Dec 6, 2014, 3:55:48 AM12/6/14
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To complete what André said:

Not all python modules are directly available in Python. If a regular
CPython package has several dependencies you should check that the
dependencies are available in Brython. In this case, __future__
doesn't exist in Brython as it is focused in Python3. Also, the
logging module, needed by pubchempy, is not still available in
Brython.

If a CPython module has C, C++, fortran,..., dependencies it will not
run in Brython. Brython runs in a different environment, Browser, than
CPython, where javascript is the only first class citizen.
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Billy Earney

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Dec 6, 2014, 8:17:44 AM12/6/14
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Also, those modules do not currently run in brython.  One day they might, if the c code is translated to python or javascript.

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Vitali Coltuclu

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Dec 6, 2014, 9:23:20 AM12/6/14
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Thank you all for a detailed explanation on how importing modules works. It would be nice to have such functionality in Brython.

Best,
Vitali
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