class

问题 I am learning python(3) after using C# for several years. Therefore i am coding some home project in python but i encountered some issue i cant seem to figuere out how to do in python. Lets say i have a simple class like this: class SomeItem: def __init__(self, var1, var2, var3): # Instance Variable self.var1= var1 self.var2= var2 self.var3 = var3 At some point in my code i am using this class to put a bunch of them in a list; list_of_SomeItems = [] list_of_SomeItems.append(SomeItem("apple",

问题 Will any function defined in the header file automatically be inline? If I declare a function in a class and give the definition outside using keyword inline, will this function be inline? If it is, why this does not against the law that inline function should be given the body at declaration? 回答1: Any function defined inside a class definition is inline. Any function marked inline is also inline. class C { int f() { return 3; } // inline int g(); int h(); } inline int C::g() { return 4; } //

问题 I am new to LinkedList class, and facing difficulties as to how to use it in order to implement or instantiate stack and queues object. I am not looking for piece of self-implemented codes. I wanted to know how do we use this class as stack and queues and can use the already defined methods: pop,push,enqueue and dequeue or top (in case of stacks). 回答1: Queue A LinkedList is already a queue, since it implements the Queue interface (and check the Javadoc yourself). Hence it has the following

问题 Following is the __init__ method of the Local class from the werkzeug library: def __init__(self): object.__setattr__(self, '__storage__', {}) object.__setattr__(self, '__ident_func__', get_ident) I don't understand two things about this code: Why did they write object.__setattr__(self, '__storage__', {}) instead of simply `setattr(self, '__storage__', {})` Why did they even use __setattr__ if the could simply write self.__storage__ = {} 回答1: This ensures that the default Python definition of

问题 In Python, can you have classes with members that are themselves pointers to members of the type of the same class? For example, in C, you might have the following class for a node in a binary tree: struct node { int data; struct node* left; struct node* right; } How would you equivalently create this in python? 回答1: Python is a dynamic language. Attributes can be bound at (almost) any time with any type. Therefore, the problem you are describing does not exist in Python. 回答2: Emulating a C

问题 I have a module named cTask with the code below in it: Private pMile As String Public Property Get Mile() As String Mile = pMile End Property Public Property Let Mile(Value As String) pMile = Value End Property So in my sub lets say I initiate dim currtask as cTask I would like to write curtask.Mile=TIM and also curtask.Mile.stat=2 just as worksook("qqq").sheets("okko").cells(1,1)... how do I do the nested properties in my class? EDIT: so Have in one class named cTask Private pMile As cMile

问题 This question already has an answer here : need to understand the flow of __init__, __new__ and __call__ (1 answer) Closed 2 years ago . From my understanding the __call__ method inside a class implements the function call operator, for example: class Foo: def __init__(self): print("I'm inside the __init__ method") def __call__(self): print("I'm inside the __call__ method") x = Foo() #outputs "I'm inside the __init__ method" x() #outputs "I'm inside the __call__ method" However, I'm going

问题 I'm trying to create a class that returns a value, not self. I will show you an example comparing with a list: >>> l = list() >>> print(l) [] >>> class MyClass: >>> pass >>> mc = MyClass() >>> print mc <__main__.MyClass instance at 0x02892508> I need that MyClass returns a list, like list() does, not the instance info. I know that I can make a subclass of list. But is there a way to do it without subclassing? I want to imitate a list (or other objects): >>> l1 = list() >>> l2 = list() >>> l1

问题 I have a .dex file, call it classes.dex . Is there a way to "read" the contents of that classes.dex and get a list of all classes in there as full class names, including their package, com.mypackage.mysubpackage.MyClass , for exmaple? I was thinking about com.android.dx.dex.file.DexFile, but I cannot seem to find a method for retrieving an entire set of classes. 回答1: You can use the dexlib2 library as a standalone library (available in maven), to read the dex file and get a list of classes.

问题 I am implementing a list class with node and iterator, that creates a list of type Ticket, which is an object that i have defined in a class, but when i try to compile it says that there is no default constructor for List when there clearly is. Does anyone see the issue here? This is the class definition class List : public Ticket { public: List(); void tick_print(vector<Ticket*> halfticks, int i); void push_back(Ticket* data); void insert(Iterator iter, Ticket* s); Iterator erase(Iterator