inspect __init__ to skip classVars

skip_classVars.py

from dataclasses import InitVar, field, dataclass
import typing
import inspect
import re

CV = typing.ClassVar  # this kills the regex ._.


@dataclass
class Foo:
    var_1: int
    var_2: float = field(init=False)
    var_3: InitVar[str]
    var_4: typing.ClassVar[int] = -1
    var_5: CV[int] = -2

    def __post_init__(self, var_3):
        self.var_2 = int(var_3) + 1

    @classmethod
    def from_dict(cls, env):
        return cls(**{
           k: v for k, v in env.items()
           if k in cls.__dataclass_fields__
           and cls.__dataclass_fields__[k].init
           and not re.search(fr'{k}: .*ClassVar', inspect.getsource(cls))
        })



# works
Foo.from_dict({'var_1': 4, 'var_2': 5, 'var_3': 7, 'var_4': 9})

# doesn't work
Foo.from_dict({'var_1': 4, 'var_2': 5, 'var_3': 7, 'var_4': 9, 'var_5': 10})