Use typing.Text instead of str for Cython defined functions

[GhislainJ]

• I'm submitting a ...

  • bug report
  • feature request

• What is the current behavior?

Jsonschema computation fails at mypy level (get_type_hints) when usin str typing for a function (init for example) that is defined inside cython compiled module.

This is due to unicode beeing used as typing (cython is running with Python2 ?) and failing in typing.get_type_hints accordingly to this discussion :

python/typing#208

This issue is a bit harsh but it does basically say that unicode type (py2) and str (py3) are incompatible. Instead typing.Text is a type alias that checks for Union[str, unicode]

• If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem Avoid reference to other packages

import volmdlr
from typing import get_type_hints
print(volmdlr.Point3D.__init__.__annotations__)
get_type_hints(volmdlr.Point3D.__init__)

Traceback :

File "/home/jezequel/Documents/Dessia/git/dessia-platform-backend/dessia_platform_backend/routes/classes.py", line 54, in get_jsonschema
    jsonschema = class_.jsonschema()
  File "/home/jezequel/Documents/Dessia/git/dessia-common/dessia_common/core.py", line 340, in jsonschema
    annotations = get_type_hints(init)
  File "/usr/lib/python3.9/typing.py", line 1442, in get_type_hints
    value = _eval_type(value, globalns, localns)
  File "/usr/lib/python3.9/typing.py", line 277, in _eval_type
    return t._evaluate(globalns, localns, recursive_guard)
  File "/usr/lib/python3.9/typing.py", line 533, in _evaluate
    eval(self.__forward_code__, globalns, localns),
  File "<string>", line 1, in <module>

• What is the expected behavior?

• What is the motivation / use case for changing the behavior?

Good jsonchema computation of volmdlr.core_compiled.pyx classes. At the moment it breaks on platform side :

https://gitea.dessia.tech/DessiA/frontend/issues/394

• Possible fixes

Replace every str typing by typing.Text as for Point3D :

class Point3D(Vector3D):
    _standalone_in_db = False

    def __init__(self, x: float, y: float, z: float, name: Text=''):
        Vector3D.__init__(self, x, y, z, name)

This fixes the issue. I opened a branch with the example for Point3D if we want to implement this fix

• Please tell us about your environment:

  • branch: dev
  • commit: 68c81b5
  • fix branch: text-typing
  • commit: b193481
  • python version: 3.9

[masfaraud]

Fixed on dev c3501c9