Can't get dev environment setup properly

[migdard]

Hi,

Using debian 10 and thus python 3.7 I encounter the following issue when running

`~/electricitymap-contrib$ poetry install -E parsers
Installing dependencies from lock file

Package operations: 1 install, 0 updates, 0 removals

• Installing demjson (2.2.4)

EnvCommandError

Command ['/home/miguel/electricitymap-contrib/.venv/bin/pip', 'install', '--no-deps', '-r', '/tmp/demjson-2.2.4hatm0_e2reqs.txt'] errored with the following return code 1, and output:
Collecting demjson==2.2.4
Using cached demjson-2.2.4.tar.gz (131 kB)
ERROR: Command errored out with exit status 1:
command: /home/miguel/electricitymap-contrib/.venv/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-t7gf13w_/demjson_c9e27dba7b58443e95237a0b74a5b4c1/setup.py'"'"'; file='"'"'/tmp/pip-install-t7gf13w_/demjson_c9e27dba7b58443e95237a0b74a5b4c1/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(file) if os.path.exists(file) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, file, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-w60ze67z
cwd: /tmp/pip-install-t7gf13w_/demjson_c9e27dba7b58443e95237a0b74a5b4c1/
Complete output (1 lines):
error in demjson setup command: use_2to3 is invalid.
----------------------------------------
WARNING: Discarding https://files.pythonhosted.org/packages/96/67/6db789e2533158963d4af689f961b644ddd9200615b8ce92d6cad695c65a/demjson-2.2.4.tar.gz#sha256=31de2038a0fdd9c4c11f8bf3b13fe77bc2a128307f965c8d5fb4dc6d6f6beb79 (from https://pypi.org/simple/demjson/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
ERROR: Could not find a version that satisfies the requirement demjson==2.2.4 (from versions: 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.0.1, 2.2, 2.2.1, 2.2.2, 2.2.3, 2.2.4)
ERROR: No matching distribution found for demjson==2.2.4

at ~/.local/lib/python3.7/site-packages/poetry/utils/env.py:1180 in run
1176│ output = subprocess.check_output(
1177│ cmd, stderr=subprocess.STDOUT, **kwargs
1178│ )
1179│ except CalledProcessError as e:
→ 1180│ raise EnvCommandError(e, input=input)
1181│
1182│ return decode(output)
1183│
1184│ def execute(self, bin, *args, **kwargs):
`

What am I doing wrong or how could I solve this ?

Thanks in advance