Creates a property called myprop, internally stored as _myprop,
that is instantiated only once, read only, and return the value
DefaultValue()
@lazyproperty('_myprop')
def myprop(self):
return DefaultValue()
self.myprop == <instance DefaultValue>
Optionally, the store name can be omitted, in this case the name used
to store the value will be the name given for this property with a _
(underscore) in front of it. The code bellow creates exactly the same
property (with the same persistence name used) as the code above:
@lazyproperty()
def myprop(self):
return DefaultValue()
self.myprop == <instance DefaultValue>
Creates a property called myprop2, internally stored as _myprop2,
that accepts being set, but, if no value is given to it, it returns
'DefaultValue()', and can be deleted, with causes it to return its default
value
@lazyproperty('_myprop2', fset=True, fdel=True)
def myprop2(self):
return DefaultValue()
self.myprop2 == DefaultValue()
self.myprop2 = 10
self.myprop2 == 10
del self.myprop2
self.myprop2 == DefaultValue()
Creates a property called myprop3, internally stored as _FOO,
that accepts being set but only if is basestring, then append a string
at the end. It also cannot be deleted.
def myprop3(self, value):
if not isinstance(value, basestring):
raise Exception('NOOOO')
return value + ' software engineer'
@lazyproperty('_FOO', fset=True, fdel=True)
def myprop3(self):
return 'No one'
self.myprop3 == 'No one'
self.myprop3 = 'Jean Schmidt'
self.myprop3 == 'Jean Schmidt software engineer'
self.myprop3 = 10
Traceback(....)
del self.myprop3
Traceback(....)
self.myprop3 == 'Jean Schmidt software engineer'