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I need a neat way to print nothing or a number

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What's a neat way to print columns of numbers with blanks where a number
is zero or None?

E.g. I want to output something like:-

    Credit      Debit   Description
    100.00              Initial balance
    123.45              Payment for cabbages
                202.00  Telephone bill


For each line I have either the credit or the debit amount and the other
is 0 or None.  However you can't get number formatting (old or new) to
output a blank for 0 and it barfs on None.

-- 
Chris Green

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I need a neat way to print nothing or a number cl@isbd.net - 2013-03-26 15:50 +0000
  Re: I need a neat way to print nothing or a number Chris Angelico <rosuav@gmail.com> - 2013-03-27 03:08 +1100
  Re: I need a neat way to print nothing or a number John Gordon <gordon@panix.com> - 2013-03-26 16:29 +0000
  Re: I need a neat way to print nothing or a number Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2013-03-26 17:06 +0000
  Re: I need a neat way to print nothing or a number Chris Angelico <rosuav@gmail.com> - 2013-03-27 04:14 +1100
  Re: I need a neat way to print nothing or a number Peter Otten <__peter__@web.de> - 2013-03-26 18:22 +0100
  Re: I need a neat way to print nothing or a number Ethan Furman <ethan@stoneleaf.us> - 2013-03-26 10:21 -0700
  Re: I need a neat way to print nothing or a number Chris Angelico <rosuav@gmail.com> - 2013-03-27 05:48 +1100
  Re: I need a neat way to print nothing or a number Tony the Tiger <tony@tiger.invalid> - 2013-03-27 01:11 -0500
  Re: I need a neat way to print nothing or a number Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de> - 2013-03-27 08:23 +0000

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