fix(py): OSError([arg]): works

Author: litlighilit

src/pylib/pyerrors/oserr/init.nim

@@ -6,6 +6,9 @@ template gen(name, typ, thirdDefVal){.dirty.} =
   proc name*(myerrno: cint, strerr: string,
       filename = thirdDefVal, winerror: cint = 0, filename2 = ""): ref PyOSError =
     OSError_new[types.typ](true, myerrno, strerr, filename, winerror, filename2)
+  proc name*(strerr: string = ""): ref PyOSError =
+    new result
+    result.strerror = strerr
 
 template gen(typ, thirdDefVal){.dirty.} =
   gen(`new typ`, typ, thirdDefVal)