Paolino wrote:
> Now this is the non polluting version :
>
> class translate:
> import string
> all=string.maketrans('','')
> badcars=all.translate(all,string.letters+string.digits)
> @staticmethod
> def __call__(text,table=string.maketrans(badcars,'_'*len(badcars))):
> return text.translate(table)
> translate=translate()
>
## As now a good solution I got (from a RexFi hint in IRC) is via
## classmethods as it doesn't use free variables.
import string
class translate(object):
all=string.maketrans('','')
badcars=all.translate(all,string.letters+string.digits)
table=string.maketrans(badcars,'_'*len(badcars))
@classmethod
def translate(cls,text):
return text.translate(cls.table)
translate=translate.translate
#### Refactoring again this is the more elegant
import string
class translateUnderscore(object):
all=string.maketrans('','')
badcars=all.translate(all,string.letters+string.digits)
table=string.maketrans(badcars,'_'*len(badcars))
def __new__(cls,text):
return text.translate(cls.table)
#### Which allows for part-function reuse:
class translateQuestionmark(translate):
table=string.maketrans(translate.badcars,'?'*len(translate.badcars))
translateUnderscore('[EMAIL PROTECTED]')
translateQuestionmark('[EMAIL PROTECTED]')
###############
An inefficency for these solutions is the further indirection to lookup
attribute 'table' in the call (cls.table). (From RexFi also)
Regards Paolino
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