unicode strings should not raise an error if used in repr.

Python 2 doesn't allow unicode objects in __repr__ methods. Therefore we need to encode them as utf-8 bytes.

jedi/_compatibility.py

@@ -180,3 +180,21 @@ def no_unicode_pprint(dct):
     import pprint
     s = pprint.pformat(dct)
     print(re.sub("u'", "'", s))
+
+
+def utf8_repr(func):
+    """
+    ``__repr__`` methods in Python 2 don't allow unicode objects to be
+    returned. Therefore cast them to utf-8 bytes in this decorator.
+    """
+    def wrapper(self):
+        result = func(self)
+        if isinstance(result, unicode):
+            return result.encode('utf-8')
+        else:
+            return result
+
+    if is_py3:
+        return func
+    else:
+        return wrapper