Enforce positional-only parameters for public functions

Resolves #18
davidfstr · Dec 23, 2023 · ddc3e72 · ddc3e72
1 parent 7343b04
commit ddc3e72
Showing 1 changed file with 9 additions and 3 deletions.
diff --git a/trycast.py b/trycast.py
@@ -280,19 +280,25 @@ def trycast(
 
 @overload
 def trycast(
-    tp: Type[_T], value: object, failure: _F, *, strict: bool = True, eval: bool = True
+    tp: Type[_T],
+    value: object,
+    /,
+    failure: _F,
+    *,
+    strict: bool = True,
+    eval: bool = True,
 ) -> Union[_T, _F]:
     ...  # pragma: no cover
 
 
 @overload
 def trycast(
-    tp: object, value: object, failure: _F, *, strict: bool = True, eval: bool = True
+    tp: object, value: object, /, failure: _F, *, strict: bool = True, eval: bool = True
 ) -> Union[object, _F]:
     ...  # pragma: no cover
 
 
-def trycast(tp, value, failure=None, *, strict=True, eval=True):
+def trycast(tp, value, /, failure=None, *, strict=True, eval=True):
     """
     If `value` is in the shape of `tp` (as accepted by a Python typechecker
     conforming to PEP 484 "Type Hints") then returns it, otherwise returns