On Sat, 10 Nov 2012 02:26:28 -0800, Tobia Conforto wrote:
> Hello
>
> Lately I have been writing a lot of list join() operations variously
> including (and included in) string format() operations.
>
> For example:
>
> temps = [24.369, 24.550, 26.807, 27.531, 28.752]
>
> out = 'Temperatures: {0} Celsius'.format(
> ', '.join('{0:.1f}'.format(t) for t in temps)
> )
>
> # => 'Temperatures: 24.4, 24.6, 26.8, 27.5, 28.8 Celsius'
>
> This is just a simple example, my actual code has many more join and
> format operations, split into local variables as needed for clarity.
Good plan! But then you suggest:
> Here is what I came up with:
> out = 'Temperatures: {0:", ":.1f} Celsius'.format(temps)
> # => 'Temperatures: 24.4, 24.6, 26.8, 27.5, 28.8 Celsius'
>
> Here ", " is the joiner between the items and <.1f> is the format string
> for each item.
And there goes all the clarity.
Is saving a few words of Python code so important that you would prefer
to read and write an overly-terse, cryptic mini-language?
If you're worried about code re-use, write a simple helper function:
def format_items(format, items):
template = '{0:%s}' % format
return ', '.join(template.format(item) for item in items)
out = 'Temperatures: {0} Celsius'.format( format_items('.1f, temps) )
--
Steven
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