Tim Daneliuk a écrit :
On 8/19/2010 7:23 PM, Steven D'Aprano wrote:
On Thu, 19 Aug 2010 18:27:11 -0500, Tim Daneliuk wrote:
Problem:
Given tuples in the form (key, string), use 'key' to determine what
string method to apply to the string:
table = {'l': str.lower, 'u': str.upper}
table['u']('hello world')
'HELLO WORLD'
(snip)
>
Yeah ... those old assembler memories never quite fade do they.
I dunno what you might call this. A Function Dispatch Table
perhaps?
I usually refers to this idiom as "dict-based dispatch". And FWIW, it's
in fact (part of...) polymorphic dispatch implemention in Python's
object model:
>>> str.__dict__['lower']
<method 'lower' of 'str' objects>
>>> d = dict(l="lower", u="upper")
>>> s = "aHa"
>>> for k, v in d.items():
... print "%s : %s" % (k, s.__class__.__dict__[v](s))
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