[stresstests] Fixes Data repr

celery/utils/debug.py

@@ -122,7 +122,7 @@ def hfloat(f, p=5):
 
 def humanbytes(s):
     return next(
-        hfloat(s / div if div else s) + unit
+        '{0}{1}'.format(hfloat(s / div if div else s), unit)
         for div, unit in UNITS if s >= div
     )
 

funtests/stress/stress/data.py

@@ -11,7 +11,7 @@ class Data(object):
         self.data = data
 
     def __str__(self):
-        return '<Data: {0} {1}>'.format(
+        return '<Data: {0} ({1})>'.format(
             self.label, humanbytes(len(self.data)),
         )