On 10/26/2016 6:17 PM, Chris Barker wrote:
I"ve lost track of what (If anything) is actually being proposed here...
so I"m going to try a quick summary:
1) an easy way to spell "remove all the characters other than these"
In other words, 'only keep these'.
We already have easy ways to create filtered strings.
>>> s = 'kjskljkxcvnalsfjaweirKJZknzsnlkjsvnskjszsdscccjasfdjf'
>>> s2 = ''.join(c for c in s if c in set('abc'))
>>> s2
'caaccca'
>>> s3 = ''.join(filter(lambda c: c in set('abc'), s))
>>> s3
'caaccca'
I expect the first to be a bit faster. Either can be wrapped in a
keep() function. If one has a translation dictionary d, use that in
twice in the genexp.
>>> d = {'a': '1', 'b': '3x', 'c': 'fum'}
>>> ''.join(d[c] for c in s if c in d.keys())
'fum11fumfumfum1'
--
Terry Jan Reedy
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