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Re: I need a neat way to print nothing or a number

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On Wed, Mar 27, 2013 at 4:21 AM, Ethan Furman <ethan@stoneleaf.us> wrote:
> On 03/26/2013 10:06 AM, Wolfgang Maier wrote:
>>
>> Chris Angelico <rosuav <at> gmail.com> writes:
>>
>>>
>>> Try printing out this expression:
>>>
>>> "%.2f"%value if value else ''
>>>
>>> Without the rest of your code I can't tell you how to plug that in,
>>> but a ternary expression is a good fit here.
>>>
>>> ChrisA
>>>
>>
>> Unfortunately, that's not working, but gives a TypeError: a float is
>> required
>> when the first value evaluates to False.
>> Apparently it's not that easy to combine number formatting with logical
>> operators - the same happens with my idea ('{:.2f}').format(value or '').
>
>
> Use parens then:
>
> ("%.2f" % value) if value else ''

According to the operator precedence table, the parens are unnecessary there.

ChrisA

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Thread

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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