the encoding directive must be a comment

pudb/lowlevel.py

@@ -78,7 +78,7 @@ def lookup_module(filename):
 # stolen from Python 3.1's tokenize.py, by Ka-Ping Yee
 
 import re
-cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile("^\s*#.*coding[:=]\s*([-\w.]+)")
 from codecs import lookup, BOM_UTF8
 
 def detect_encoding(readline):

test/test-encoding.py

@@ -0,0 +1,5 @@
+def f(encoding=None):
+	print 'ENCODING:', encoding
+
+from pudb import runcall
+runcall(f)