How to say $a=$b->{"A"} ||={} in Python?
Sébastien Buchoux
seb.buchoux at gmail.com
Fri Aug 17 09:35:47 CEST 2007
beginner a écrit :
> Hi All.
>
> I'd like to do the following in more succint code:
>
> if k in b:
> a=b[k]
> else:
> a={}
> b[k]=a
>
> a['A']=1
>
>
> In perl it is just one line: $a=$b->{"A"} ||={}.
>
> Thanks,
> Geoffrey
>
>
One solution I often use in such cases:
try:
a = b[k]
except KeyError: #or except IndexError: if b is a list/tuple and not a dict
a = {}
b[k] = a
a['A'] = 1
Indeed, exceptions are handled faster than "if/else" loops. As it was
mentionned earlier, One neat solution in Perl may not be the perfect one
in Python.
Cheers,
Sébastien
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