Object that initializes to itself in C++
来源： https://stackoverflow.com/questions/31759210/object-that-initializes-to-itself-in-c
self
Naming the self parameter something else
来源： https://stackoverflow.com/questions/37885330/naming-the-self-parameter-something-else
Naming the self parameter something else
来源： https://stackoverflow.com/questions/37885330/naming-the-self-parameter-something-else
How can a class that inherits from a NumPy array change its own values?
问题 I have a simple class that inherits from the NumPy n-dimensional array. I want to have two methods of the class that can change the array values of an instance of the class. One of the methods should set the array of the class instance to the values of a list data attribute of the class instance and the other of the methods should append some list values to the array of the class instance. I'm not sure how to accomplish this, but my attempt is as follows: import numpy class Variable(numpy
del self vs self.__del__() - and what is the proper way to cleanup in python?
问题 I have a python script that contains a class. This class has a __del__ method for usual cleanup. If I delete the class during the normal execution of the script, I want some cleanup to be done. I also have a signal handler, that does some unusual cleanup. If the script was in the middle of executing something else when it received the signal, it needs to do some extra cleanup, followed by the regular cleanup. I noticed there is a difference between doing del self and self.__del__() . Namely,
del self vs self.__del__() - and what is the proper way to cleanup in python?
问题 I have a python script that contains a class. This class has a __del__ method for usual cleanup. If I delete the class during the normal execution of the script, I want some cleanup to be done. I also have a signal handler, that does some unusual cleanup. If the script was in the middle of executing something else when it received the signal, it needs to do some extra cleanup, followed by the regular cleanup. I noticed there is a difference between doing del self and self.__del__() . Namely,
del self vs self.__del__() - and what is the proper way to cleanup in python?
问题 I have a python script that contains a class. This class has a __del__ method for usual cleanup. If I delete the class during the normal execution of the script, I want some cleanup to be done. I also have a signal handler, that does some unusual cleanup. If the script was in the middle of executing something else when it received the signal, it needs to do some extra cleanup, followed by the regular cleanup. I noticed there is a difference between doing del self and self.__del__() . Namely,
del self vs self.__del__() - and what is the proper way to cleanup in python?
问题 I have a python script that contains a class. This class has a __del__ method for usual cleanup. If I delete the class during the normal execution of the script, I want some cleanup to be done. I also have a signal handler, that does some unusual cleanup. If the script was in the middle of executing something else when it received the signal, it needs to do some extra cleanup, followed by the regular cleanup. I noticed there is a difference between doing del self and self.__del__() . Namely,
PHP中new static 的用法和new self 之间的区别
3 月，跳不动了？>>> 啥都不多说： 举个栗子： class wangjh{ /** * @return wangjh 实例化self */ public function selfObj(){ return new self(); } /** * @return static 实例化static */ public function staticObj(){ return new static(); } /** * @return string 获取被调用的类的名称 */ public function sayClass(){ return get_called_class().'<br>'; } } class extendWangjh extends wangjh{ } class root extends extendWangjh{ } $a = new wangjh(); $aObj = $a->selfObj(); $b = new wangjh(); $bObj = $b->staticObj(); $c = new extendWangjh(); $cObj = $c->selfObj(); $d = new extendWangjh(); $dObj = $d->staticObj(); var_dump($aObj == $bObj); // true var
Python calling method without 'self'
问题 So I just started programming in python and I don't understand the whole reasoning behind 'self'. I understand that it is used almost like a global variable, so that data can be passed between different methods in the class. I don't understand why you need to use it when your calling another method in the same class. If I am already in that class, why do I have to tell it?? example, if I have: Why do I need self.thing()? class bla: def hello(self): self.thing() def thing(self): print "hello"