diff --git a/piker/data/_sharedmem.py b/piker/data/_sharedmem.py
index 5d38cbbd..9c515ce3 100644
--- a/piker/data/_sharedmem.py
+++ b/piker/data/_sharedmem.py
@@ -394,6 +394,7 @@ def open_shm_array(
 
     # "unlink" created shm on process teardown by
     # pushing teardown calls onto actor context stack
+
     tractor._actor._lifetime_stack.callback(shmarr.close)
     tractor._actor._lifetime_stack.callback(shmarr.destroy)
 
diff --git a/piker/data/_source.py b/piker/data/_source.py
index 46302508..8ec92dfd 100644
--- a/piker/data/_source.py
+++ b/piker/data/_source.py
@@ -133,9 +133,11 @@ def mk_symbol(
 
 
 def from_df(
+
     df: pd.DataFrame,
     source=None,
     default_tf=None
+
 ) -> np.recarray:
     """Convert OHLC formatted ``pandas.DataFrame`` to ``numpy.recarray``.