Also move FailedUnicode to powerline/lib/unicode

powerline/__init__.py

@@ -7,7 +7,7 @@ import logging
 
 from powerline.colorscheme import Colorscheme
 from powerline.lib.config import ConfigLoader
-from powerline.lib.unicode import safe_unicode
+from powerline.lib.unicode import safe_unicode, FailedUnicode
 
 from threading import Lock, Event
 
@@ -15,19 +15,6 @@ from threading import Lock, Event
 DEFAULT_SYSTEM_CONFIG_DIR = None
 
 
-class FailedUnicode(unicode):
-	'''Builtin ``unicode`` (``str`` in python 3) subclass indicating fatal 
-	error.
-
-	If your code for some reason wants to determine whether `.render()` method 
-	failed it should check returned string for being a FailedUnicode instance. 
-	Alternatively you could subclass Powerline and override `.render()` method 
-	to do what you like in place of catching the exception and returning 
-	FailedUnicode.
-	'''
-	pass
-
-
 def find_config_file(search_paths, config_file):
 	config_file += '.json'
 	for path in search_paths:

powerline/lib/unicode.py

@@ -43,3 +43,16 @@ def safe_unicode(s):
 				return unicode(s, getpreferredencoding())
 	except Exception as e:
 		return safe_unicode(e)
+
+
+class FailedUnicode(unicode):
+	'''Builtin ``unicode`` (``str`` in python 3) subclass indicating fatal 
+	error.
+
+	If your code for some reason wants to determine whether `.render()` method 
+	failed it should check returned string for being a FailedUnicode instance. 
+	Alternatively you could subclass Powerline and override `.render()` method 
+	to do what you like in place of catching the exception and returning 
+	FailedUnicode.
+	'''
+	pass