class

问题 Given: case class FirstCC { def name: String = ... // something that will give "FirstCC" } case class SecondCC extends FirstCC val one = FirstCC() val two = SecondCC() How can I get "FirstCC" from one.name and "SecondCC" from two.name ? 回答1: def name = this.getClass.getName Or if you want only the name without the package: def name = this.getClass.getSimpleName See the documentation of java.lang.Class for more information. 回答2: You can use the property productPrefix of the case class: case

问题 Why does a class need to define __iter__() returning self, to get an iterator of the class? class MyClass: def __init__(self): self.state = 0 def __next__(self): self.state += 1 if self.state > 4: raise StopIteration return self.state myObj = MyClass() for i in myObj: print(i) Console log: Traceback (most recent call last): for i in myObj: TypeError: 'MyClass' object is not iterable the answer https://stackoverflow.com/a/9884259/4515198, says An iterator is an object with a next (Python 2) or

问题 I am trying to call a variable defined in a function, inside another function of the same class, but with self doesn't work. class Project(): def function1(self): a='hello world,' def function2(self): b=self.a + ' I am alive' Project1=Project() print Project1.function1() print Project1.function2() python says: Project instance has no attribute 'a' . I don't know very well how to use classes. I didn't use __init__ 'cause I do not have anything to put, is there maybe a way to add it even if I

问题 I am trying to call a variable defined in a function, inside another function of the same class, but with self doesn't work. class Project(): def function1(self): a='hello world,' def function2(self): b=self.a + ' I am alive' Project1=Project() print Project1.function1() print Project1.function2() python says: Project instance has no attribute 'a' . I don't know very well how to use classes. I didn't use __init__ 'cause I do not have anything to put, is there maybe a way to add it even if I

问题 I am making a small game in the console that takes place over several days. The game starts by initializing the miners ore and money amounts as 0. When he mines, my function chooses a random integer between 20 and 71 that will then award him that amount in 'ore'. I am trying to assign the ore that has been mined to my player's ore amount. I am having a reoccurring error that states that += is an unsupported operand for method and int. Full code and trace is below. Code import pyautogui as pag

问题 I am comparing lavaan objects using semTools::compareFit . It is throwing a very strange error message. I tried also the following reproducible example: data("HolzingerSwineford1939",package="lavaan") HS.modelA <- ' visual =~ x1 + x2 + x3 textual =~ x4 + x5 + x6 speed =~ x7 + x8 + x9' HS.modelB<- ' visual =~ x1 + x2 textual =~ x4 + x5 + x6 speed =~ x7 + x8 + x9' fit.A<- cfa(HS.modelA, data = HolzingerSwineford1939) fit.B<- cfa(HS.modelB, data = HolzingerSwineford1939) semTools::compareFit(fit

问题 I am comparing lavaan objects using semTools::compareFit . It is throwing a very strange error message. I tried also the following reproducible example: data("HolzingerSwineford1939",package="lavaan") HS.modelA <- ' visual =~ x1 + x2 + x3 textual =~ x4 + x5 + x6 speed =~ x7 + x8 + x9' HS.modelB<- ' visual =~ x1 + x2 textual =~ x4 + x5 + x6 speed =~ x7 + x8 + x9' fit.A<- cfa(HS.modelA, data = HolzingerSwineford1939) fit.B<- cfa(HS.modelB, data = HolzingerSwineford1939) semTools::compareFit(fit

问题 I was writing a small python script to understand a concept and got another confusion. Here's the code - x = 5 y = 3 class Exp(object): def __init__(self, x, y): self.x = x self.y = y print("In",x, y, self.x, self.y) print("Middle",x,y) print("Out",x,y) Exp(1,2) The output is - Middle 5 3 Out 5 3 In 1 2 1 2 Now, my concept was python interpreter starts reading and executing the code from the first line to last line. It executes the code inside a class only when it is "called", not when it is

问题 I'm doing a parsser for a class call virtual_machine, I'm trying to build a vectors of function for it, but some of those function on vm takes arguments (different numbers/types of arguments) can i still put those in my vector of fuction since they where only void (*f)(); here's the code class Virtual_Machine { public: /***/ void clear(); void pop(); void clear(); void assert(std::string const &value); void push(eOperandType const &e, std::string const &str); /***/ } class Parser { public: /*

问题 This question already has answers here : Change what the *splat and **splatty-splat operators do to my object (2 answers) Closed last month . The title basically says it all. I would like to create my own class whose instances can be used with the double asterix ( ** ) syntax. I searched for this quite some time. And while I found gazillions of posts explaining how to use the ** syntax, or discussing the caveats of subclassing dict, I couldn't find a single post on how to implement this