On 18/01/25 12:33, Ian Pilcher via Python-list wrote:
I am making my first attempt to use type hinting in a new project, and
I'm quickly hitting areas that I'm having trouble understanding. One of
them is how to write type hints for a method decorator.
Here is an example that illustrates my confusion. (Sorry for the
length.)
import collections.abc
class BufferScanner(object):
...
@staticmethod
def _check_eof(method: collections.abc.Callable -> (
collections.abc.Callable
):
...
I cannot figure out how to correctly specify the Callable argument and
return type for _check_eof(). As indicated by the name, method should
be a method (of the BufferScanner class), so its first positional
argument should always be an instance of BufferScanner, but it could
have any combination of positional and/or keyword arguments after that.
Is it a typing problem?
The def is not syntactically-correct (parentheses).
What happens once corrected?
Also, which tool is 'complaining', and what does it have to say?
General comment: as far as type-hints go, rather than trying to learn
how to deal with complex situations, it might be better to ease-in
gradually - add the easy stuff now, and come back to deal with the rest
later (otherwise the typing 'tail' is wagging the coding 'dog'!)
--
Regards,
=dn
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