diff --git a/example/src/if_data_plot.py b/example/src/if_data_plot.py
index 2aa1713..a982b53 100644
--- a/example/src/if_data_plot.py
+++ b/example/src/if_data_plot.py
@@ -15,7 +15,7 @@
     file_path = sys.argv[1]
 else:
     print(f"Usage: {sys.argv[0]} [file]")
-    exit()
+    sys.exit()
 
 with open(file_path, "rb") as f:
     # Read little endian float32 from file
diff --git a/src/calculate_bounds.py b/src/calculate_bounds.py
index 4d5a1fa..ff4c437 100755
--- a/src/calculate_bounds.py
+++ b/src/calculate_bounds.py
@@ -44,12 +44,12 @@ def pr(name, type_fp, type_int=None, radix=None, lower=None, upper=None):
         sign = 1
 
     # Calculate lower and upper limits
-    if lower == None:
+    if lower is None:
         if sign == 1:
             lower = -math.pow(2, bits - radix - sign)
         else:
             lower = 0.0
-    if upper == None:
+    if upper is None:
         upper = math.pow(2, bits - radix - sign) - math.pow(2, -radix)
 
     # String fixing and printout