Raise a defined exception

mmoya · mmoya · commit 7c327aefd927 · 2015-03-17T19:14:23.000+01:00
InvalidLabelName is undefined, just raise a ValueError with a consistent
message.
diff --git a/prometheus_client/__init__.py b/prometheus_client/__init__.py
@@ -102,7 +102,7 @@ def __init__(self, wrappedClass, labelnames, **kwargs):
 
     for l in labelnames:
       if l.startswith('__'):
-        raise InvalidLabelName(l)
+        raise ValueError('Invalid label metric name: ' + l)
 
   def labels(self, *labelvalues):
     '''Return the child for the given labelset.'''
