use @six.python_2_unicode_compatible decorator to make str(Record) wo…

…rk correctly in Python 2; use six.text_type when building list of textual strings. Fixes issue #74.

pymarc/record.py

@@ -28,6 +28,7 @@
 
 isbn_regex = re.compile(r'([0-9\-xX]+)')
 
+@six.python_2_unicode_compatible
 class Record(Iterator):
     """
     A class for representing a MARC record. Each Record object is made up of
@@ -81,7 +82,7 @@ def __str__(self):
         """
         # join is significantly faster than concatenation
         text_list = ['=LDR  %s' % self.leader]
-        text_list.extend([str(field) for field in self.fields])
+        text_list.extend([six.text_type(field) for field in self.fields])
         text = '\n'.join(text_list) + '\n'
         return text