Fix value_formatter acces. It's not in config to_dict as it's a function.

pygal/__init__.py

@@ -21,7 +21,7 @@ Pygal -  A python svg graph plotting library
 
 """
 
-__version__ = '1.2.1'
+__version__ = '1.2.2'
 import sys
 from pygal.config import Config
 from pygal.ghost import Ghost

pygal/graph/base.py

@@ -77,7 +77,7 @@ class BaseGraph(object):
     @property
     def _format(self):
         """Return the value formatter for this graph"""
-        return self.value_formatter or (
+        return self.config.value_formatter or (
             humanize if self.human_readable else str)
 
     def _compute(self):

pygal/test/test_config.py

@@ -210,6 +210,15 @@ def test_logarithmic_big_scale():
     assert len(q(".y.axis .guides")) == 41
 
 
+def test_value_formatter():
+    line = Line(value_formatter=lambda x: str(x) + '‰')
+    line.add('_', [10 ** 4, 10 ** 5, 23 * 10 ** 4])
+    q = line.render_pyquery()
+    assert len(q(".y.axis .guides")) == 11
+    assert q(".axis.y text").map(texts) == list(map(
+        lambda x: str(x) + '‰', map(float, range(20000, 240000, 20000))))
+
+
 def test_logarithmic_small_scale():
     line = Line(logarithmic=True)
     line.add('_', [1 + 10 ** 10, 3 + 10 ** 10, 2 + 10 ** 10])