Creating slice notation from string
robert.kern at gmail.com
Thu Sep 3 01:35:53 CEST 2009
On 2009-09-02 17:55 PM, Bob van der Poel wrote:
>> For a one-liner:
>> x[slice(*map(int, x[1:-1].split(':')))]
> Almost works :)
> For s="" and s="[1:2]" it's fine. But, if I have
> s = "[:2]" then I get:
>>>> x[slice(*[int(i) for i in s.strip("").split(":")])]
> Traceback (most recent call last):
> File "<stdin>", line 1, in<module>
> ValueError: invalid literal for int() with base 10: ''
> Similar problem with [2:].
Expanding out to a couple of lines now:
slice_args = 
for i in s.strip("").split(':'):
if i.strip() == '':
y = x[slice(*slice_args)]
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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