"king kikapu" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
| > def func(obj):
| > if isinstance(obj, bool):
| > return not obj
| > elif isinstance(obj, int):
| > return obj * 2
| > elif isinstance(obj, basestring):
| > return obj + obj
| > else:
| > raise NotImplementedError('type %r not supported' % type(obj))
|
| I have already come up with that solution but
|...And get rid of the isinstance commands.
A sometimes alternative is a dict (untested):
func_switch = {
bool: lambda o: not o,
int: lambda i: i*2,
str: lambda s: s+s,
unicode: lambda s: s+s
}
def func(o):
try: return func_switch[type(o)]
except IndexError:
raise NotImplementedError('type %r not supported' % type(obj))
but this does not work for instances of subclasses the way isinstance does.
tjr
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