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A simple python decorator for defining properties that only run their fget function once

Project description

A simple python decorator for defining properties that only run their fget function once.

  • Free software: BSD license


A Python property that only calls its fget function one time. How many times have you written this code (or similar)?

def class C(object):

    def name(self):
        if not hasattr(self, '_name'):
            self._name = some_expensive_load()
        return self._name

I’ve written it just enough times to be annoyed enough to capture this module. The result is this:

from memoized_property import memoized_property

def class C(object):

    def name(self):
        # Boilerplate guard conditional avoided, but this is still only called once
        return some_expensive_load()


I couldn’t find a pre-existing version of this on PyPI. I found one other on GitHub,, but it was not published to PyPI.


1.0.3 (2016-09-28)

  • Build universal wheels
  • Support Python 3.4, 3.5

1.0.2 (2014-05-02)

  • Remove dependency on six

1.0.1 (2014-01-01)

  • Added python 3.2 compatability

1.0.0 (2013-12-26)

  • First release on PyPI.

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