Flatpak and Python

[Goffi]

Hello,

I'm trying to package my software for Flatpak (https://salut-a-toi.org), 
and I'm run into a couple of issues (flatpak version: 0.99.2)  :

1) it's using Python, I've run into this page:
https://www.loganasherjones.com/2018/05/using-flatpak-with-python/
which is installing Python manually (while it's already in 
org.freedesktop.Platform runtime), then activating network for 
installation, but http://docs.flatpak.org/en/latest/python.html says to 
download depencies separately then install without network.
Is the way with network activation OK ?

2) the project is using Python 2. The flatpak-pip-generator script use the 
--prefix option with pip, but the pip2 available in the image is too old 
(7.1.0 while last version is 10.0.1) and doesn't have this option. Would is 
be possible to update it in the runtime ?

3) I try to update myself pip, then to install my dependencies, you can see 
my manifest attached. I keep getting a "No matching distribution found for 
setuptools" while I explictly install setuptools

4) there is a FS issue, /app/lib/python2.7/site-packages/easy-install.pth 
can't be updated:
% flatpak-builder build-dir org.salutatoi.SAT.json --force-clean --build-
shell=sat
Downloading sources
========================================================================
Building module sat in /home/goffi/dev/sat_docs/flatpak/.flatpak-builder/
build/sat-43
========================================================================
sh-4.3$ cd /app/lib/python2.7/site-packages/
sh-4.3$ cat easy-install.pth 
import sys; sys.__plen = len(sys.path)
./lxml-3.7.3-py2.7-linux-x86_64.egg
import sys; new = sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p = 
getattr(sys, '__egginsert', 0); sys.path[p:p] = new; sys.__egginsert = p + 
len(new)
sh-4.3$ echo test >> easy-install.pth 
sh: easy-install.pth: Read-only file system
sh-4.3$ 


So for now I'm blocked. Any help would be welcomed, thanks in advance!

Goffi
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