Best way to use globally format

[Cecil Westerhof]

I have a file where I used a lot of {0}, {1} and {2}. Most but not all
are changed to {0:.3E}, {1:.3E} and {2:.3E}. But when I want to change
the format I come in dependency hell.

I could do something like:
    format = ':.3E'
    fmt0   = '{0' + format + '}
    fmt1   = '{1' + format + '}
    fmt2   = '{2' + format + '}

and replace occurrences of:
    'before {0} after'
with:
    'before ' + fmt0 + ' after'

But that does not really make me happy. Is there a better way?

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof