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string.Formatter doesn't support empty curly braces "{}" unlike str.format .
>>> import string
>>> a = string.Formatter()
>>> a.format("{}","test")
Traceback (most recent call last):
 File "<pyshell#2>", line 1, in <module>
 a.format("{}","hello")
 File "/usr/lib/python3.2/string.py", line 180, in format
 return self.vformat(format_string, args, kwargs)
 File "/usr/lib/python3.2/string.py", line 184, in vformat
 result = self._vformat(format_string, args, kwargs, used_args, 2)
 File "/usr/lib/python3.2/string.py", line 206, in _vformat
 obj, arg_used = self.get_field(field_name, args, kwargs)
 File "/usr/lib/python3.2/string.py", line 267, in get_field
 obj = self.get_value(first, args, kwargs)
 File "/usr/lib/python3.2/string.py", line 226, in get_value
 return kwargs[key]
KeyError: ''