Python: Programming for Intermediates: Learn the Fundamentals of Python in 7 Days by Michael Knapp
Author:Michael Knapp
Language: eng
Format: epub
Tags: python, java, programming, python programming
Publisher: WhiteFlowerPublsihing
Published: 2019-03-18T16:00:00+00:00
Example
Class_name = finances
Class_parents = (element)
Class_body = “ “ “
Num_finances = 0
Def _int_ (own, title, balance) :
Own. Title = title
Own. Balance = balance
Finacnes.num_finances += 1
Def del_finances (own) :
Def _getattr_ (own, title):
Return : no attribute called { }. Format (title)
Finances. Num_finances -=1
Def insert (own, amount) :
Own. Balance = own. Balance
Def output (own, amount)
Own balance = own balance
Def search (own)
Return “title = { }, balance, = { }” format (own .title, own balance)
L = financial ( ‘ele’, 3)
L. financial
No attributes have been called by the name of financial.
You have to be careful with the implementation for _getattr_ due to the fact that the implementation references for the attribute instance are not going to exist which is then going to cause an infinite loop to occur.
_getattribute_: you are going to be implementing the customization of your attribute so that it can access a class. The use of this method is always going to be called unconditionally whenever you are accessing the attribute for the instance in that class.
_setattr_: this method will start to implement the attribute assignment that is unconditional. This method should only be placed on the value that is being assigned into the dictionary for that attribute rather than to us a different code which is going to cause you to get an infinite recursive call. _setattr_( ) will be used whenever the attribute instance assignment needs it to be. Your base class method is going to use the same name, and in using it, the code will look like this: super ( ) _setattr_ (self, title, amount).
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