Add NRLRespone.__str__ so NRL leaves print nice.

obspy/clients/nrl/client.py

@@ -129,7 +129,7 @@ class NRL(object):
                         descr = '<no description>'
                     descr = self._clean_str(descr)
                     resp_path = self._choose(section, path)
-                    nrl_dict[section] = (descr, resp_path)
+                    nrl_dict[section] = NRLResponse((descr, resp_path))
                     continue
                 else:
                     msg = "Unexpected structure of NRL file '{}'".format(path)
@@ -239,6 +239,11 @@ class NRLPath(str):
     pass
 
 
+class NRLResponse(tuple):
+    def __str__(self):
+        return '{} : {}'.format(self[0], self[1])
+
+
 class LocalNRL(NRL):
     """
     Subclass of NRL for accessing local copy NRL.