From bb33663472497a70314af0dafe98527afb4fd01a Mon Sep 17 00:00:00 2001
From: Matt Jeffery <matt@musicmetric.com>
Date: Fri, 1 Mar 2013 20:14:18 +0000
Subject: [PATCH] replace '&' with &amp; when it is not in a character entity
 (approximation)

---
 pylast.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pylast.py b/pylast.py
index c73f9e0..b3f9572 100644
--- a/pylast.py
+++ b/pylast.py
@@ -33,6 +33,7 @@ import tempfile
 import sys
 import collections
 import warnings
+import re
 
 def _deprecation_warning(message):
     warnings.warn(message, DeprecationWarning)
@@ -847,6 +848,10 @@ class _Request(object):
         except Exception as e:
             raise MalformedResponseError(self.network, e)
 
+        # Pretty decent catch for invalid & characters - which last.fm
+        # seems to generate for some artist eg. "K'nann"
+        response_text = re.sub("&(?![^\W]+;)", "&amp;", response_text)
+
         self._check_response_for_errors(response_text)
         return response_text