Same GET-Property for multiple Attributes
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I recently heared about properties, and that you can assign functions to the getter or setter of a attribute within a class. So you can do value Checks or different things.
I want to ask if it's possible to assign the same function to the getter of multiple attributes. To do that the function needs a dynamic return, so that the value X is returned if X was called, and Y if Y was called.
I could do a own getter for every Attribute, but in my case are 20+ Attributes which need to call that Function, so it would be nicer to have the dynamic call.
Testing with __getattributes__ was a total disaster, because I always got it looped endlessly, so either is wasn't possible that way or I just made mistakes.
Is that possible? Something like that:
class example():
def __init__(self):
self.__x = 1
self.__y = 2
def do_something(self):
#Do something which is needed by multiple attributes
#without changes
attribute_name = '__' + attribute_name
return self.__dict__[attribute_name]
x = property(fget=do_something)
y = property(fget=do_something)
...
EDIT 1:
My full Code where I could need dynamic property Getter.
https://repl.it/@TobiasWagner/TV-DB-Django
python dynamic properties attributes
asked Nov 16 '18 at 11:49
TkayTkay
398
add a comment |
I recently heared about properties, and that you can assign functions to the getter or setter of a attribute within a class. So you can do value Checks or different things.
I want to ask if it's possible to assign the same function to the getter of multiple attributes. To do that the function needs a dynamic return, so that the value X is returned if X was called, and Y if Y was called.
I could do a own getter for every Attribute, but in my case are 20+ Attributes which need to call that Function, so it would be nicer to have the dynamic call.
Testing with __getattributes__ was a total disaster, because I always got it looped endlessly, so either is wasn't possible that way or I just made mistakes.
Is that possible? Something like that:
class example():
def __init__(self):
self.__x = 1
self.__y = 2
def do_something(self):
#Do something which is needed by multiple attributes
#without changes
attribute_name = '__' + attribute_name
return self.__dict__[attribute_name]
x = property(fget=do_something)
y = property(fget=do_something)
...
EDIT 1:
My full Code where I could need dynamic property Getter.
https://repl.it/@TobiasWagner/TV-DB-Django
python dynamic properties attributes
asked Nov 16 '18 at 11:49
TkayTkay
398
Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.
– jonrsharpe
Nov 16 '18 at 11:53
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with__getattribute__(self, name)but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT
– Tkay
Nov 16 '18 at 14:31
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36
add a comment |
I recently heared about properties, and that you can assign functions to the getter or setter of a attribute within a class. So you can do value Checks or different things.
I want to ask if it's possible to assign the same function to the getter of multiple attributes. To do that the function needs a dynamic return, so that the value X is returned if X was called, and Y if Y was called.
I could do a own getter for every Attribute, but in my case are 20+ Attributes which need to call that Function, so it would be nicer to have the dynamic call.
Testing with __getattributes__ was a total disaster, because I always got it looped endlessly, so either is wasn't possible that way or I just made mistakes.
Is that possible? Something like that:
class example():
def __init__(self):
self.__x = 1
self.__y = 2
def do_something(self):
#Do something which is needed by multiple attributes
#without changes
attribute_name = '__' + attribute_name
return self.__dict__[attribute_name]
x = property(fget=do_something)
y = property(fget=do_something)
...
EDIT 1:
My full Code where I could need dynamic property Getter.
https://repl.it/@TobiasWagner/TV-DB-Django
python dynamic properties attributes
asked Nov 16 '18 at 11:49
TkayTkay
398
I recently heared about properties, and that you can assign functions to the getter or setter of a attribute within a class. So you can do value Checks or different things.
I want to ask if it's possible to assign the same function to the getter of multiple attributes. To do that the function needs a dynamic return, so that the value X is returned if X was called, and Y if Y was called.
I could do a own getter for every Attribute, but in my case are 20+ Attributes which need to call that Function, so it would be nicer to have the dynamic call.
Testing with __getattributes__ was a total disaster, because I always got it looped endlessly, so either is wasn't possible that way or I just made mistakes.
Is that possible? Something like that:
class example():
def __init__(self):
self.__x = 1
self.__y = 2
def do_something(self):
#Do something which is needed by multiple attributes
#without changes
attribute_name = '__' + attribute_name
return self.__dict__[attribute_name]
x = property(fget=do_something)
y = property(fget=do_something)
...
EDIT 1:
My full Code where I could need dynamic property Getter.
https://repl.it/@TobiasWagner/TV-DB-Django
python dynamic properties attributes
python dynamic properties attributes
asked Nov 16 '18 at 11:49
TkayTkay
398
asked Nov 16 '18 at 11:49
TkayTkay
398
edited Nov 16 '18 at 14:34
Tkay
asked Nov 16 '18 at 11:49
TkayTkay
398
asked Nov 16 '18 at 11:49
TkayTkay
398
asked Nov 16 '18 at 11:49
TkayTkay
398
398
Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.
– jonrsharpe
Nov 16 '18 at 11:53
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with__getattribute__(self, name)but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT
– Tkay
Nov 16 '18 at 14:31
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36
add a comment |
Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.
– jonrsharpe
Nov 16 '18 at 11:53
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with__getattribute__(self, name)but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT
– Tkay
Nov 16 '18 at 14:31
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36
Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.
x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.– jonrsharpe
Nov 16 '18 at 11:53
Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.
x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.– jonrsharpe
Nov 16 '18 at 11:53
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with
__getattribute__(self, name) but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT– Tkay
Nov 16 '18 at 14:31
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with
__getattribute__(self, name) but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT– Tkay
Nov 16 '18 at 14:31
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36
add a comment |
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Sure, you can implement the descriptor protocol and just provide the backing attribute name, e.g.
x = magic_property('__x'). Note that leading double underscores probably isn't what you want, though: stackoverflow.com/q/7456807/3001761.– jonrsharpe
Nov 16 '18 at 11:53
You might also find codereview.stackexchange.com/q/98892/32391 interesting.
– jonrsharpe
Nov 16 '18 at 11:59
@jonrsharpe Thanks for the quick response, I kinda at a loss here. I don't quite understand whats going on at your post. I tried playing around with
__getattribute__(self, name)but it failed because I can't use functions in there. And if I want to work with properties I need to transfer the name of the calling attribute to the new getter. Here is my Code, maybe it will help. [Class TBDB.py Row 180] REPL.IT– Tkay
Nov 16 '18 at 14:31
Please edit to give a Minimal, Complete, and Verifiable example
– jonrsharpe
Nov 16 '18 at 14:36