More robust type introspection and error handling

dib-lab · Sep 15, 2017 · f0f61cd · f0f61cd
1 parent ed7556f
commit f0f61cd
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/khmer/_oxli/graphs.pyx b/khmer/_oxli/graphs.pyx
@@ -218,8 +218,11 @@ cdef class Hashtable:
             _parser = (<FastxParser>parser_or_filename)._this
         elif isinstance(parser_or_filename, ReadParser):
             _parser = (<CPyReadParser_Object*>parser_or_filename).parser
-        else:
+        elif is_str(parser_or_filename):
             _parser = get_parser[CpFastxReader](_bstring(parser_or_filename))
+        else:
+            raise TypeError('argument does not appear to be a parser or a '
+                            'filename: {}'.format(parser_or_filename))
         return _parser