diff --git a/Lib/tabnanny.py b/Lib/tabnanny.py
index 46f8163..5b9b444 100755
--- a/Lib/tabnanny.py
+++ b/Lib/tabnanny.py
@@ -126,6 +126,9 @@
             else: print(file, badline, repr(line))
         return
 
+    finally:
+        f.close()
+
     if verbose:
         print("%r: Clean bill of health." % (file,))
 
@@ -185,21 +188,21 @@
         # count, il = self.norm
         # for i in range(len(count)):
         #    if count[i]:
-        #        il = il + (i/tabsize + 1)*tabsize * count[i]
+        #        il = il + (i//tabsize + 1)*tabsize * count[i]
         # return il
 
         # quicker:
-        # il = trailing + sum (i/ts + 1)*ts*count[i] =
-        # trailing + ts * sum (i/ts + 1)*count[i] =
-        # trailing + ts * sum i/ts*count[i] + count[i] =
-        # trailing + ts * [(sum i/ts*count[i]) + (sum count[i])] =
-        # trailing + ts * [(sum i/ts*count[i]) + num_tabs]
-        # and note that i/ts*count[i] is 0 when i < ts
+        # il = trailing + sum (i//ts + 1)*ts*count[i] =
+        # trailing + ts * sum (i//ts + 1)*count[i] =
+        # trailing + ts * sum i//ts*count[i] + count[i] =
+        # trailing + ts * [(sum i//ts*count[i]) + (sum count[i])] =
+        # trailing + ts * [(sum i//ts*count[i]) + num_tabs]
+        # and note that i//ts*count[i] is 0 when i < ts
 
         count, trailing = self.norm
         il = 0
         for i in range(tabsize, len(count)):
-            il = il + i/tabsize * count[i]
+            il = il + i//tabsize * count[i]
         return trailing + tabsize * (il + self.nt)
 
     # return true iff self.indent_level(t) == other.indent_level(t)