On 10/19/13 5:44 PM, Peter Cacioppi wrote:
Is the following considered poor Python form?
class Foo (object) :
_lazy = None
def foo(self, x) :
_lazy = _lazy or self.get_something(x)
def get_something(self, x) :
# doesn't really matter
I like this idiom for certain situations, just wondering if it will raise the
hackles of other Pythonistas.
I use this idiom sparingly, but sometimes it just fits the task at hand, I hear Guidos
voice saying "use the Force" in my ear, etc.
You present this as a choice between __init__ or a class attribute, but
those two things are very different. Is your intent to have an instance
attribute, or a class attribute? Lazily populated instance attributes
are fine, I would do it like this:
class Foo(object):
def __init__(self):
self._lazy = None
def foo(self, x):
if self._lazy is None:
self._lazy = self.get_something(x)
...
--Ned.
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