justpy: demjeson install cannot be done since setuptools upgrade, so neither justpy can.

Today on a new deploy I did :

pip3 install justpy

but ends up failing because:

ERROR: Cannot install justpy==0.0.5, justpy==0.0.6, justpy==0.0.7, justpy==0.0.8, justpy==0.0.9, justpy==0.1.0, justpy==0.1.1, justpy==0.1.2, justpy==0.1.3, justpy==0.1.4 and justpy==0.1.5 because these package versions have conflicting dependencies.

The conflict is caused by:
    justpy 0.1.5 depends on demjson>=2.2.4
    justpy 0.1.4 depends on demjson>=2.2.4
    justpy 0.1.3 depends on demjson>=2.2.4
    justpy 0.1.2 depends on demjson>=2.2.4
    justpy 0.1.1 depends on demjson>=2.2.4
    justpy 0.1.0 depends on demjson>=2.2.4
    justpy 0.0.9 depends on demjson>=2.2.4
    justpy 0.0.8 depends on demjson>=2.2.4
    justpy 0.0.7 depends on demjson>=2.2.4
    justpy 0.0.6 depends on demjson>=2.2.4
    justpy 0.0.5 depends on demjson>=2.2.4

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

it is an open issue at demjson repo:

https://github.com/dmeranda/demjson/issues/40

Downgrading to setuptools 57.5.0 it des not work, it installs but while doing:

import justpy

gives:

import justpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/data/giodegas/dev/AQ2009/myenv/lib/python3.8/site-packages/justpy/__init__.py", line 1, in <module>
    from .justpy import *
  File "/data/giodegas/dev/AQ2009/myenv/lib/python3.8/site-packages/justpy/justpy.py", line 13, in <module>
    from .chartcomponents import *
  File "/data/giodegas/dev/AQ2009/myenv/lib/python3.8/site-packages/justpy/chartcomponents.py", line 2, in <module>
    import demjson
  File "/data/giodegas/dev/AQ2009/temp/demjson/demjson.py", line 645
    class json_int( (1L).__class__ ):    # Have to specify base this way to satisfy 2to3
                      ^
SyntaxError: invalid syntax

@elimintz what can I do now? Thank you for your support.