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# Even better
def lazy_property(fn):
'''Decorator that makes a property lazy-evaluated.
attr_name = '_lazy_' + fn.__name__
def _lazy_property(self):
if not hasattr(self, attr_name):
setattr(self, attr_name, fn(self))
return getattr(self, attr_name)
return _lazy_property
class Person:
def __init__(self, name, occupation): = name
self.occupation = occupation
def relatives(self):
# Get all relatives
relatives = ...
return relatives
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