diff --git a/heudiconv/heuristics/example.py b/heudiconv/heuristics/example.py
index 1649ae7f..28ae6c7d 100644
--- a/heudiconv/heuristics/example.py
+++ b/heudiconv/heuristics/example.py
@@ -72,11 +72,12 @@ def infotodict(
     }
     last_run = len(seqinfo)
     for s in seqinfo:
-        series_num_str = s.series_id.split('-', 1)[0]
+        series_num_str = s.series_id.split("-", 1)[0]
         if not series_num_str.isdecimal():
             raise ValueError(
                 f"This heuristic can operate only on data when series_id has form <series-number>-<something else>, "
-                f"and <series-number> is a numeric number. Got series_id={s.series_id}")
+                f"and <series-number> is a numeric number. Got series_id={s.series_id}"
+            )
         series_num: int = int(series_num_str)
         sl, nt = (s.dim3, s.dim4)
         if (sl == 176) and (nt == 1) and ("MPRAGE" in s.protocol_name):
diff --git a/heudiconv/parser.py b/heudiconv/parser.py
index bb8b73e1..27d822e1 100644
--- a/heudiconv/parser.py
+++ b/heudiconv/parser.py
@@ -279,8 +279,9 @@ def infotoids(
             lgr.info("Study session for %r", study_session_info)
 
             if grouping != "all":
-                assert (study_session_info not in study_sessions), (
+                assert study_session_info not in study_sessions, (
                     f"Existing study session {study_session_info} "
-                    f"already in analyzed sessions {study_sessions.keys()}")
+                    f"already in analyzed sessions {study_sessions.keys()}"
+                )
             study_sessions[study_session_info] = seqinfo
     return study_sessions
diff --git a/tox.ini b/tox.ini
index a120066b..5e62db0c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -41,7 +41,7 @@ filterwarnings =
     # <https://github.com/sensein/etelemetry-client/pull/44>
     ignore:.*pkg_resources:DeprecationWarning
     # <https://github.com/nipy/nipype/issues/3563>
-    ignore:Use setlocale\(\), getencoding\(\) and getlocale\(\) instead:DeprecationWarning:nipype
+    ignore:.*Use setlocale.* instead:DeprecationWarning:nipype
 
 [coverage:run]
 include = heudiconv/*