diff --git a/pydfc/dfc_utils.py b/pydfc/dfc_utils.py
index c22e548..2e9ab73 100644
--- a/pydfc/dfc_utils.py
+++ b/pydfc/dfc_utils.py
@@ -941,7 +941,7 @@ def visualize_FCS(
     measure, normalize=True, fix_lim=True, save_image=False, output_root=None
 ):
 
-    if measure.FCS == []:
+    if measure.FCS is []:
         return
 
     if normalize:
diff --git a/pydfc/task_utils.py b/pydfc/task_utils.py
index 4970e00..daaf95e 100644
--- a/pydfc/task_utils.py
+++ b/pydfc/task_utils.py
@@ -46,9 +46,9 @@ def events_time_to_labels(
         if events[i, 2] in event_types:
             start_time = float(events[i, 0])
             end_time = float(events[i, 0]) + float(events[i, 1])
-            start_TR = int(np.rint(start_time * Fs))
-            end_TR = int(np.rint(end_time * Fs))
-            event_labels[start_TR:end_TR] = event_types.index(events[i, 2])
+            start_timepoint = int(np.rint(start_time * Fs))
+            end_timepoint = int(np.rint(end_time * Fs))
+            event_labels[start_timepoint:end_timepoint] = event_types.index(events[i, 2])
 
     if return_0_1:
         event_labels = np.multiply(event_labels != 0, 1)
diff --git a/task_dFC/dFC_assessment.py b/task_dFC/dFC_assessment.py
index 47c5f22..a381f95 100644
--- a/task_dFC/dFC_assessment.py
+++ b/task_dFC/dFC_assessment.py
@@ -1,7 +1,6 @@
 import os
 import time
 import warnings
-from calendar import c
 
 import numpy as np