File size: 823 Bytes
0220cd3 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | """Helpers for properties."""
def with_doc(f):
return property(f, None, None, f.__doc__)
# copied over unmodified from
# https://github.com/devpi/devpi/blob/master/common/devpi_common/types.py
def cached(f):
"""returns a cached property that is calculated by function f."""
def get(self):
try:
return self._property_cache[f]
except AttributeError:
self._property_cache = {}
except KeyError:
pass
res = f(self)
self._property_cache[f] = res
return res
def set(self, val):
propcache = self.__dict__.setdefault("_property_cache", {})
propcache[f] = val
def fdel(self):
propcache = self.__dict__.setdefault("_property_cache", {})
del propcache[f]
return property(get, set, fdel)
|