On Fri, 20 Nov 2015 16:53:47 +0100, Peter Otten wrote:
> Ervin Hegedüs wrote:
>> Python has a good string formatter, eg. I can do this:
>> s = "{who} likes {what}"
>> d = {'who': "Adam", 'what': "ants"}
>> s.format(**d)
>> result:
>> 'Adam likes ants'
>> Is it possible, and if yes, how to resolve the placeholders names in
>> string?
>>>> import string for item in string.Formatter().parse("{who} likes
>>>> {what}"):
> ... print(item)
> ...
> ('', 'who', '', None)
> (' likes ', 'what', '', None)
Or even:
>>> s = "{who} likes {what}"
>>> d = {'who': "Adam", 'what': "ants"}
>>> keys = [x[1] for x in string.Formatter().parse(s)]
>>> keys
['who', 'what']
then ...
for key in keys:
if key not in d:
raise KeyError("Missing key '{}' in format string '{}'".format
(key, s))
--
Denis McMahon, denismfmcma...@gmail.com
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