leading 0s format

Author: FoamyGuy

adafruit_pycamera/__init__.py

@@ -827,7 +827,7 @@ def open_next_image(self, extension="jpg", filename_prefix="img"):
         except OSError as exc:  # no SD card!
             raise RuntimeError("No SD card mounted") from exc
         while True:
-            filename = f"/sd/{filename_prefix}{self._image_counter}.{extension}"
+            filename = f"/sd/{filename_prefix}{self._image_counter:04d}.{extension}"
             self._image_counter += 1
             try:
                 os.stat(filename)