1 files changed, 6 insertions, 3 deletions
diff --git a/lib/extras.py b/lib/extras.py
index 1f85d53..9c26ccb 100644
--- a/lib/extras.py
+++ b/lib/extras.py
@@ -363,12 +363,15 @@ class NamedTupleCursor(_cursor):
             return
 
     def _make_nt(self):
+        # ascii except alnum and underscore
+        nochars = ' !"#$%&\'()*+,-./:;<=>?@[\\]^`{|}~'
+        re_clean = _re.compile('[' + _re.escape(nochars) + ']')
+
         def f(s):
-            # NOTE: Python 3 actually allows unicode chars in fields
-            s = _re.sub('[^a-zA-Z0-9_]', '_', s)
+            s = re_clean.sub('_', s)
             # Python identifier cannot start with numbers, namedtuple fields
             # cannot start with underscore. So...
-            if _re.match('^[0-9_]', s):
+            if s[0] == '_' or '0' <= s[0] <= '9':
                 s = 'f' + s
 
             return s