diff --git a/pysystemmgr/obmc/system/__init__.py b/pysystemmgr/obmc/system/__init__.py
index 7bcea9e..2d5b752 100644
--- a/pysystemmgr/obmc/system/__init__.py
+++ b/pysystemmgr/obmc/system/__init__.py
@@ -18,9 +18,9 @@
 
 
 def convertGpio(name):
-    offset = int(''.join(list(filter(str.isdigit, name))))
+    offset = int("".join(list(filter(str.isdigit, name))))
     port = list(filter(str.isalpha, name.upper()))
-    a = ord(port[-1]) - ord('A')
+    a = ord(port[-1]) - ord("A")
     if len(port) > 1:
         a += 26
     base = a * 8 + GPIO_BASE