fix input types

Author: ehinman

dataretrieval/waterdata/api.py

@@ -1649,18 +1649,18 @@ def get_samples(
 def get_statistics(
         service: STATISTICS_SERVICES = "observationNormals",
         approval_status: Optional[str] = None,
-        computation_type: Optional[str] = None,
-        country_code: Optional[str] = None,
-        state_code: Optional[str] = None,
-        county_code: Optional[str] = None,
-        start_date: Optional[Union[str, pd.datetime]] = None,
-        end_date: Optional[Union[str, pd.datetime]] = None,
-        monitoring_location_id: Optional[str] = None,
+        computation_type: Optional[Union[str, list[str]]] = None,
+        country_code: Optional[Union[str, list[str]]] = None,
+        state_code: Optional[Union[str, list[str]]] = None,
+        county_code: Optional[Union[str, list[str]]] = None,
+        start_date: Optional[str] = None,
+        end_date: Optional[str] = None,
+        monitoring_location_id: Optional[Union[str, list[str]]] = None,
         page_size: int = 1000,
-        parent_timeseries_id: Optional[str] = None,
-        site_type_code: Optional[str] = None,
-        site_type_name: Optional[str] = None,
-        parameter_code: Optional[str] = None,
+        parent_timeseries_id: Optional[Union[str, list[str]]] = None,
+        site_type_code: Optional[Union[str, list[str]]] = None,
+        site_type_name: Optional[Union[str, list[str]]] = None,
+        parameter_code: Optional[Union[str, list[str]]] = None,
         ) -> Tuple[pd.DataFrame, BaseMetadata]:
     """Get water data statistics from the USGS Water Data API.
     This service provides endpoints for access to computations on the