diff --git a/src/cal_tools/constants.py b/src/cal_tools/constants.py
index bef79dc4e7e307f5f2e0fff66c51c00b3613c815..a5052a1e261c23b83aae5f2c86ffd5fb36caf759 100644
--- a/src/cal_tools/constants.py
+++ b/src/cal_tools/constants.py
@@ -137,7 +137,7 @@ def inject_ccv(const_src, ccv_root, report_to):
     unique_name = detector_type[:detector_type.index('-Type')] + ' Def'
     cond_hash = md5(pdu_name.encode())
     cond_hash.update(pdu_uuid.to_bytes(
-        length=8, byteorder='little', signed=False))3
+        length=8, byteorder='little', signed=False))
 
     for param_dict in cond_params:
         cond_hash.update(str(param_dict['parameter_name']).encode())
@@ -194,9 +194,12 @@ def inject_ccv(const_src, ccv_root, report_to):
     copyfile(const_src, const_dest)
 
 
-def inject_ccv_legacy(in_folder, metadata_folder, runs, calibration, cond, pdu, const_input, begin_at):
+def inject_ccv_legacy(in_folder, metadata_folder, runs, calibration, cond,
+                      pdu, const_input, begin_at):
     """Inject new CCV into CalCat.
 
+    LEGACY VERSION - DO NOT USE
+    (from before most details were saved in CCV file itself)
 
     metadata_folder
     calibration -> in file, but pass anyway as there could be multiple
@@ -209,13 +212,15 @@ def inject_ccv_legacy(in_folder, metadata_folder, runs, calibration, cond, pdu,
         metadata_folder,  # Same as notebook parameter
         [run_high, run_mid, run_low],
         'Offset',
-        current_pdu,  # Element of calibration_client.from get_all_phy_det_units_from_detector
+        current_pdu,  # Element of calibration_client.from
+                      # get_all_phy_det_units_from_detector
         out_folder / 'my-constant-file.h5',
         get_dir_creation_date(in_folder, run_high)
     )
 
     Args:
-        in_folder (str or Path): Root for input data, i.e. *not* containing r{run:04d} folder
+        in_folder (str or Path): Root for input data, i.e. *not*
+            containing r{run:04d} folder
         metadata_folder (str or Path): Metadata location
         runs (Iterable of str or int): Run number(s) used for characterization.
         calibration (str): Calibration name, e.g. 'Offset', must exist in CalCat.
@@ -246,7 +251,8 @@ def inject_ccv_legacy(in_folder, metadata_folder, runs, calibration, cond, pdu,
     # Generate condition name.
     unique_name = detector_type[:detector_type.index('-Type')] + ' Def'
     cond_hash = hashlib.md5(pdu_name.encode())
-    cond_hash.update(pdu['uuid'].to_bytes(length=8, byteorder='little', signed=False))
+    cond_hash.update(pdu['uuid'].to_bytes(
+        length=8, byteorder='little', signed=False))
 
     for key, value in cond_dict.items():
         cond_hash.update(str(key).encode())
@@ -305,7 +311,8 @@ def inject_ccv_legacy(in_folder, metadata_folder, runs, calibration, cond, pdu,
         }
     }
 
-    resp = CalibrationClient.inject_new_calibration_constant_version(calibration_client(), inject_h)
+    resp = CalibrationClient.inject_new_calibration_constant_version(
+        calibration_client(), inject_h)
 
     if not resp['success']:
         raise RuntimeError(resp)