CODEWITHSUNDEEP
pythonpython-3.xfunctionclassorder-of-execution
bpb101
bpb101

Reputation: 1071

Does the order of variables and functions matter in Class (Python)

When defining variables and functions within a class in python 3.x does it matter in which order you define variables and functions?

Is class code pre-complied before you would call the class in main?

Upvotes: 6

Views: 6104

Answers (3)

Super Kai - Kazuya Ito
Super Kai - Kazuya Ito

Reputation: 1

It doesn't matter in which order variables and functions are defined in Class in Python.

For example, there is "Text" class as shown below then it works properly displaying "Hello World":

class Text:
    text1 = "Hello"
    
    def __init__(self, text2):
        self.text2 = text2            
   
    def helloWorld(self):
        return self.text1 + " " + self.text2
       
    def display(self):    
        print(self.helloWorld())
        
text = Text("World")
text.display() # "Hello World" is displayed

Next, I turned the class attributes upside down as shown below then it still works properly displaying "Hello World":

class Text:
    def display(self):    
        print(self.helloWorld())
   
    def helloWorld(self):
        return self.text1 + " " + self.text2
        
    def __init__(self, text2):
        self.text2 = text2
        
    text1 = "Hello"
        
text = Text("World")
text.display() # "Hello World" is displayed

Upvotes: 0

Alex Martelli
Alex Martelli

Reputation: 881665

By default, all names defined in the block of code right within the class statement become keys in a dict (that's passed to the metaclass to actually instantiate the class when said block is all done). In Python 3 you can change that (the metaclass can tell Python to use another mapping, such as an OrderedDict, if it needs to make definition order significant), but that's not the default.

Upvotes: 3

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 798666

The order of class attributes does not matter except in specific cases (e.g. properties when using decorator notation for the accessors). The class object itself will be instantiated once the class block has exited.

Upvotes: 2

Related Questions