Paolino wrote:
> Steven D'Aprano wrote:
>
> > def translate(text):
> > import string
> > all=string.maketrans('','')
> > badcars=all.translate(all,string.letters+string.digits)
> > table=string.maketrans(badcars,'_'*len(badcars))
> > return text.translate(table)
> >
> > No pollution.
>
> And no efficience.Recalculating all,badcars and table was not an
> acceptable solution ,sorry if I didn't state this point :(
Then write a closure. You get both encapsulation and efficience, and as
a bonus, customization of the translating function:
import string
def translateFactory(validChars=string.letters+string.digits,
replaceChar='_'):
all=string.maketrans('','')
badcars=all.translate(all,validChars)
table=string.maketrans(badcars, replaceChar*len(badcars))
def translate(text):
return text.translate(table)
# bind any attributes you want to be accessible
# translate.badcars = badcars
# ...
return translate
tr = translateFactory()
tr("Hel\xfflo")
George
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