On 11/24/2022 5:05 AM, Robin Becker wrote:
I haven't used dataclasses or typing very much, but while playing about
I found this didn't give me an expected error
(.py312) robin@minikat:~/devel/reportlab
$ cat tmp/examples/tdc.py && python tmp/examples/tdc.py && mypy
tmp/examples/tdc.py
##################################
from dataclasses import dataclass
@dataclass
class DC:
a: str
b: str
def main():
dc = DC(DC, "B")
print(dc)
if __name__ == "__main__":
main()
##################################
DC(a=<class '__main__.DC'>, b='B')
Success: no issues found in 1 source file
(.py312) robin@minikat:~/devel/reportlab
DC.a is supposed to be a str and I expected mypy to indicate a type error
should typing work for this case?
--
Robin Becker
Sounds like a bug. With Python 3.10:
C:\temp\python>py -V
Python 3.10.4
C:\temp\python>py tdc.py
DC(a=<class '__main__.DC'>, b='B')
C:\temp\python>mypy tdc.py
tdc.py:10: error: Argument 1 to "DC" has incompatible type "Type[DC]";
expected "str" [arg-type]
Found 1 error in 1 file (checked 1 source file)
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