Update sleap_roots/series.py

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

sleap_roots/series.py

@@ -38,7 +38,27 @@ class Series:
     Properties:
         series_name: Name of the series derived from the HDF5 filename.
         expected_count: Fetch the expected plant count for this series from the CSV.
-        group: Group name for the series from the CSV.
+@property
+def group(self) -> str:
+   """Group name for the series from the CSV.
+
+   This property retrieves the group name (e.g., genotype) associated with the series,
+   based on the series name matched against the 'plant_qr_code' in the CSV file.
+
+   Returns:
+       The group name as a string, or np.nan if the CSV path is not set or the group name
+       cannot be found.
+   """
+    if not self.csv_path or not Path(self.csv_path).exists():
+        print("CSV path is not set or the file does not exist.")
+        return np.nan
+    df = pd.read_csv(self.csv_path)
+    try:
+        # Match the series_name (or plant_qr_code in the CSV) to fetch the group
+        return df[df["plant_qr_code"] == self.series_name]["genotype"].iloc[0]
+    except IndexError:
+        print(f"No group found for series {self.series_name} in CSV.")
+        return np.nan
     """
 
     h5_path: Optional[str] = None