Add body for the NameSpaceError exception

ipalib/errors.py

@@ -231,8 +231,19 @@ class RegistrationError(IPAError):
 
 
 class NameSpaceError(RegistrationError):
+    """
+    Raised when name is not a valid Python identifier for use for use as
+    the name of NameSpace member.
+    """
     msg = 'name %r does not re.match %r'
 
+    def __init__(self, name, regex):
+        self.name = name
+        self.regex = regex
+
+    def __str__(self):
+        return self.msg % (self.name, self.regex)
+
 
 class SubclassError(RegistrationError):
     """