pyflakes: ignore files marked no-check-code

tests/filterpyflakes.py

@@ -2,7 +2,7 b''
 
 # Filter output by pyflakes to control which warnings we check
 
-import sys, re
+import sys, re, os
 
 def makekey(message):
     # "path/file:line: message"
@@ -25,6 +25,12 b' for line in sys.stdin:'
            ]
     if not re.search('|'.join(pats), line):
         continue
+    fn = line.split(':', 1)[0]
+    f = open(os.path.join(os.path.dirname(os.path.dirname(__file__)), fn))
+    data = f.read()
+    f.close()
+    if 'no-check-code' in data:
+        continue
     lines.append(line)
 
 for line in sorted(lines, key = makekey):