How do I access a variable in a class that was defined before in another class?
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I am trying to make a python library: There is a class (game) in it is a function that defines a variable (display) Then there is another class (char) in main, I want to access display in char How do I do it?
In the past I have tried: self.display, global display, and game.display
class game(): def __init__(self, disp, width, height): self.display = disp # VARIABLE I WANT TO ACCESS self.height = height self.width = width class sprite(): def __init__(self, size, position, image): self.image = image self.size = size self.rect = self.image.get_rect() self.rect.x = position self.rect.y = position self.x = position self.y = position self.collisionDirection = 5 self.hasCollided = False self.mask = pygame.mask.from_surface(self.image) self.velocity = 0 def render(self): self.rect.x = self.x self.rect.y = self.y self.mask = pygame.mask.from_surface(self.image) display.blit(self.image, (self.x, self.y)) # WHERE I WANT TO ACCESS IT
I keep getting AttributeError what can I do?
You can pass the Game instance to another class. For example
# instantiate the game g = game() # create an instance of char c = char(game)
__init__ of char() looks something like this:
class char(): def __init__(self, game): # save a reference to the game object as an attribute self.game = game # now you can access the game's attributes print(self.game.display)
Nested Classes (The Java™ Tutorials > Learning the Java , The Java programming language allows you to define a class within another class. Non-static nested classes (inner classes) have access to other members of nested class cannot refer directly to instance variables or methods defined in How to access a variable from a class from another in C#? 2 I can't access a variable in another of my classes even if I make the variable a static method or create a new instance of the class in question?
Allow that the below example is contrived, and not likely the way you would design pen/paper, but it shows that there are a couple different ways that you can accomplish what you ask.
class Pen: def __init__(self, thickness, color): self.thickness = thickness self.color = color class Paper: def __init__(self, pen: Pen): self.pen = pen def draw(self): pen_color = self.pen.color return pen_color def draw2(self, pen: Pen): pen_color = pen.color return pen_color red_pin = Pen(2, 'Red') blue_pin = Pen(1, 'Blue') paper = Paper(red_pin) print(paper.draw()) # prints Red print(paper.draw2(blue_pin)) # prints Blue
Python, In Python, we can define the variable outside the class, inside the class, and even inside the methods. Let's see, how to use and access these variables We can access private variable of a class in a different class in so many ways. Here is some of them: By using Public Method We can access a private variable in a different class by putting that variable with in a Public method and calling that method from another class by creating object of that class.
I figured it out:
class game(): def __init__(self, disp, width, height): global display display = disp class char(): def render(): display.blit(...........)
Microsoft Visual C#: An Introduction to Object-Oriented Programming, The instance variables of a class are the data components that exist user is a program or class that instantiates objects of another prewritten class. A class header or class definition describes a class; it contains an optional access modifier, I'm learning about when to use class variables and methods (as opposed to instance variables and methods). When you want to access a class variable in an instance method, is it necessary to use self.__class__.bar? I noticed that self.bar works even though bar is a class variable not an instance variable. – Bill Mar 29 '15 at 18:30
TEXTBOOK OF COMPUTER SCIENCE FOR CLASS XI, These statements are called definitions and must terminate with a semicolon like any other program statement . All variables must be defined before using them . Class Variables. Class variables are defined within the class construction. Because they are owned by the class itself, class variables are shared by all instances of the class. They therefore will generally have the same value for every instance unless you are using the class variable to initialize a variable.
Java Programming for Spatial Sciences, 6.1.4 Class Variables Occasionally, we may wish to create a variable inside a the same time as the class is defined, and before any objects are made out of it. I had the same problem. In order to modify variables from different classes, I made them extend the class they were to modify. I also made the super class's variables static so they can be changed by anything that inherits them. I also made them protected for more flexibility. Source: Bad experiences. Good lessons.
Programming in Python, properties of objects of another class. Before indulging in concepts in great details the basic object oriented programming (OOP) terminology is given as Class variables are defined within a class but outside any of the class's methods. A member function of a class is a function that has its definition or its prototype within the class definition like any other variable. It operates on any object of the class of which it is a member, and has access to all the members of a class for that object. Let us take previously defined class to access the members of the class using a member function instead of directly accessing them −.