How to access a containing objects properties from an object inside.
I have two objects obj1 and obj2. Inside obj1 there is an attribute for success (obj1.success) and for containing other objects (obj1.data) I am using setattr() to add obj2 as an attribute to obj1.data (obj1.data.obj2) this is working fine. My problem is when someone changes a variable in obj2 instance after it is added to obj1 e.g. obj1.data.obj2.success = False I am trying to figure out how to locate and access obj1.success when obj2.success has changed. Any assistance, pointers, ideas are much appreciated. JJ -- http://mail.python.org/mailman/listinfo/python-list
Re: How to access a containing objects properties from an object inside.
On Mar 5, 8:44 am, nuwandame nuwand...@hotmail.com wrote: I have two objects obj1 and obj2. Inside obj1 there is an attribute for success (obj1.success) and for containing other objects (obj1.data) I am using setattr() to add obj2 as an attribute to obj1.data (obj1.data.obj2) this is working fine. My problem is when someone changes a variable in obj2 instance after it is added to obj1 e.g. obj1.data.obj2.success = False I am trying to figure out how to locate and access obj1.success when obj2.success has changed. Any assistance, pointers, ideas are much appreciated. JJ Hi. There's no way in general, but if you will make a few assumptions, there are some possibilities. For example, you could make 'obj1.success' a descriptor, which searches its '__dict__', and looks for 'success' attributes in its contents. How does that strike you? -- http://mail.python.org/mailman/listinfo/python-list
Re: How to access a containing objects properties from an object inside.
Aaron Brady wrote: On Mar 5, 8:44 am, nuwandame nuwand...@hotmail.com wrote: I have two objects obj1 and obj2. Inside obj1 there is an attribute for success (obj1.success) and for containing other objects (obj1.data) I am using setattr() to add obj2 as an attribute to obj1.data (obj1.data.obj2) this is working fine. My problem is when someone changes a variable in obj2 instance after it is added to obj1 e.g. obj1.data.obj2.success = False I am trying to figure out how to locate and access obj1.success when obj2.success has changed. Any assistance, pointers, ideas are much appreciated. JJ Hi. There's no way in general, but if you will make a few assumptions, there are some possibilities. For example, you could make 'obj1.success' a descriptor, which searches its '__dict__', and looks for 'success' attributes in its contents. How does that strike you? You suggest an interesting idea which triggered another idea... Are there mechanisms for using, accessing, executing the object id? objid = id(obj1) If so, I could set that as an attribute in the subsequent object when adding it as an attribute and then call it when values of that attribute changed. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to access a containing objects properties from an object inside.
On Mar 5, 9:51 am, nuwandame nuwand...@hotmail.com wrote: Aaron Brady wrote: On Mar 5, 8:44 am, nuwandame nuwand...@hotmail.com wrote: I have two objects obj1 and obj2. Inside obj1 there is an attribute for success (obj1.success) and for containing other objects (obj1.data) I am using setattr() to add obj2 as an attribute to obj1.data (obj1.data.obj2) this is working fine. My problem is when someone changes a variable in obj2 instance after it is added to obj1 e.g. obj1.data.obj2.success = False I am trying to figure out how to locate and access obj1.success when obj2.success has changed. Any assistance, pointers, ideas are much appreciated. JJ Hi. There's no way in general, but if you will make a few assumptions, there are some possibilities. For example, you could make 'obj1.success' a descriptor, which searches its '__dict__', and looks for 'success' attributes in its contents. How does that strike you? You suggest an interesting idea which triggered another idea... Are there mechanisms for using, accessing, executing the object id? objid = id(obj1) If so, I could set that as an attribute in the subsequent object when adding it as an attribute and then call it when values of that attribute changed. I think what you are after is a weak value dictionary. But why not just store the parent as an attribute? obj2.parent= obj1. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to access a containing objects properties from an object inside.
Aaron Brady wrote: On Mar 5, 9:51 am, nuwandame nuwand...@hotmail.com wrote: Aaron Brady wrote: On Mar 5, 8:44 am, nuwandame nuwand...@hotmail.com wrote: I have two objects obj1 and obj2. Inside obj1 there is an attribute for success (obj1.success) and for containing other objects (obj1.data) I am using setattr() to add obj2 as an attribute to obj1.data (obj1.data.obj2) this is working fine. My problem is when someone changes a variable in obj2 instance after it is added to obj1 e.g. obj1.data.obj2.success = False I am trying to figure out how to locate and access obj1.success when obj2.success has changed. Any assistance, pointers, ideas are much appreciated. JJ Hi. There's no way in general, but if you will make a few assumptions, there are some possibilities. For example, you could make 'obj1.success' a descriptor, which searches its '__dict__', and looks for 'success' attributes in its contents. How does that strike you? You suggest an interesting idea which triggered another idea... Are there mechanisms for using, accessing, executing the object id? objid = id(obj1) If so, I could set that as an attribute in the subsequent object when adding it as an attribute and then call it when values of that attribute changed. I think what you are after is a weak value dictionary. But why not just store the parent as an attribute? obj2.parent= obj1. Very cool! Thanks a bunch. JJ -- http://mail.python.org/mailman/listinfo/python-list
