I wanted to postpone the introduction of a custom __setattr__
to a point later at runtime where I then wanted to use
"self.__setattr__ = self.setattr" to set this attribute. But this
did not have the effect desired to print "setattr called" as can
be seen below.

main.py

class A:
def __init__( self ):
self.__setattr__ = self.setattr
def setattr( self, key, value ):
print( 'setattr called.' )

a = A()
a.x = 1

transcript

Any idea how to achieve something like this?

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On 28/09/23 10:44 pm, Stefan Ram wrote:

class A:
def __init__( self ):
self.__setattr__ = self.setattr
def setattr( self, key, value ):
print( 'setattr called.' )

Any idea how to achieve something like this?

class A:

def __init__(self):
self.x = 17
self.setattr = self.custom_setattr

def __setattr__(self, key, value):
self.setattr(key, value)

def setattr(self, key, value):
object.__setattr__(self, key, value)

def custom_setattr(self, key, value):
print('custom_setattr:', key, '=', value)

a = A()
a.x = 1
print('a.x =', a.x)

--
Greg

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Greg Ewing <[email protected]> writes:

def __setattr__(self, key, value):
self.setattr(key, value)

|All problems in computer science can be solved by
|adding another level of indirection.

(The fundamental theorem of software engineering [FTSE] is
a term originated by Andrew Koenig to describe a remark by
Butler Lampson attributed to the late David J. Wheeler.)

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