remove redundant try import, use BytesIO for byte stream..

src/SOAPpy/Parser.py

@@ -9,10 +9,7 @@ import string
 import xml.sax
 from wstools.XMLname import fromXMLname
 import collections
-try:
-    from io import StringIO
-except ImportError:
-    from io import StringIO
+from io import StringIO, BytesIO
 
 try: from M2Crypto import SSL
 except: pass
@@ -1050,7 +1047,7 @@ class EmptyEntityResolver(xml.sax.handler.EntityResolver):
 def _parseSOAP(xml_str, rules = None, ignore_ext=None,
                forbid_entities=False, forbid_external=True, forbid_dtd=False):
     inpsrc = xml.sax.xmlreader.InputSource()
-    inpsrc.setByteStream(StringIO(xml_str))
+    inpsrc.setByteStream(BytesIO(xml_str))
     if ignore_ext is None:
         ignore_ext = False