New version of PYLINT issues warning

[jnguiot]

************* Module collectives.api
collectives\api.py:172:7: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
collectives\api.py:400:7: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
************* Module collectives.forms.auth
collectives\forms\auth.py:66:8: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
************* Module collectives.routes.administration
collectives\routes\administration.py:41:12: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
collectives\routes\administration.py:41:24: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)
************* Module collectives.routes.auth
collectives\routes\auth.py:127:21: W1309: Using an f-string that does not have any interpolated variables (f-string-without-interpolation)

Checks are failing due to a new version of pylint (2.5.0) which issue a warning if an fstring is used without reason.

[jnguiot]

On obtient aussi cette erreur:

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.7.6/x64/bin/pylint", line 8, in <module>
    sys.exit(run_pylint())
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/pylint/__init__.py", line 22, in run_pylint
    PylintRun(sys.argv[1:])
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/pylint/lint/run.py", line 338, in __init__
    linter.check(args)
  [...]
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 666, in _visit_functiondef
    body=[self.visit(child, newnode) for child in node.body],
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 666, in <listcomp>
    body=[self.visit(child, newnode) for child in node.body],
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 177, in visit
    return visit_method(node, parent)
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 911, in visit_return
    newnode.postinit(self.visit(node.value, newnode))
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 177, in visit
    return visit_method(node, parent)
  File "/opt/hostedtoolcache/Python/3.7.6/x64/lib/python3.7/site-packages/astroid/rebuilder.py", line 384, in visit_binop
    self._bin_op_classes[type(node.op)], node.lineno, node.col_offset, parent
KeyError: <class '_ast.Sub'>
##[error]Process completed with exit code 1.

[jnguiot]

Regarding the stacktrace, I have open a bug on pylint project. Our problem seems linked with dkim:
pylint-dev/pylint#3540