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simple string format question

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From Neal Becker <ndbecker2@gmail.com>
Subject simple string format question
Date Mon, 15 Oct 2012 08:12:31 -0400
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Is there a way to specify to format I want a floating point written with no more 
than e.g., 2 digits after the decimal?  I tried {:.2f}, but then I get all 
floats written with 2 digits, even if they are 0:

2.35 << yes, that's what I want
2.00 << no, I want just 2 or 2.

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simple string format question Neal Becker <ndbecker2@gmail.com> - 2012-10-15 08:12 -0400

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