tweak coverage comments & type checking

Author: jepler

src/wwvb/iersdata.py

@@ -9,6 +9,7 @@
 import datetime
 import gzip
 import importlib.resources
+import importlib.resources.abc
 import json
 
 import platformdirs
@@ -17,16 +18,19 @@
 
 content: dict[str, str] = {"START": "1970-01-01", "OFFSETS_GZ": "H4sIAFNx1mYC/wMAAAAAAAAAAAA="}
 
+path: importlib.resources.abc.Traversable
 
-for location in [
+for location in [  # pragma no branch
     platformdirs.user_data_path("wwvbpy", "unpythonic.net"),
     platformdirs.site_data_path("wwvbpy", "unpythonic.net"),
-    importlib.resources.files("wwvb"),
 ]:
     path = location / "iersdata.json"
-    if path.exists():  # pragma no cover
-        content = json.loads(path.read_text(encoding="utf-8"))
+    if path.exists():  # pragma no branch
         break
+else:  # pragma no cover
+    path = importlib.resources.files("wwvb") / "iersdata.json"
+
+content = json.loads(path.read_text(encoding="utf-8"))
 
 DUT1_DATA_START = datetime.date.fromisoformat(content["START"])
 DUT1_OFFSETS = gzip.decompress(binascii.a2b_base64(content["OFFSETS_GZ"])).decode("ascii")