put in explicit field name for 2.6 compatibility.

Author: tacaswell

lib/matplotlib/tests/test_ticker.py

@@ -64,7 +64,7 @@ def test_formatstrformatter():
     nose.tools.assert_equal('00002', tmp_form(2))
 
     # test str.format() style formatter
-    tmp_form = mticker.StrMethodFormatter('{:05d}')
+    tmp_form = mticker.StrMethodFormatter('{x:05d}')
     nose.tools.assert_equal('00002', tmp_form(2))
 
 

lib/matplotlib/ticker.py

@@ -305,14 +305,14 @@ def __call__(self, x, pos=None):
 class StrMethodFormatter(Formatter):
     """
     Use a new-style format string (as used by `str.format()`)
-    to format the tick
+    to format the tick.  The field formatting must be labeled `x`.
     """
     def __init__(self, fmt):
         self.fmt = fmt
 
     def __call__(self, x, pos=None):
         'Return the format for tick val *x* at position *pos*'
-        return self.fmt.format(x)
+        return self.fmt.format(x=x)
 
 
 class OldScalarFormatter(Formatter):