Asking just out of curiosity:

Intuitively, I would tend to think that the code below would fail because the __init__ function calls somefunc to populate somevar before the function was defined in the object's body, as would be the case for functions within a module.

Could you explain why this code actually works?

Thanks,

class someobj:
    def __init__(self):
        self.somevar = self.somefunc()
    def somefunc(self):
        return 'some_value'

obj = someobj()
print(obj.somevar)

CodePudding user response：

Calling def assigns the function code, variables etc to its name, but doesn't run the internal code. Documentation.

The interpretater looks at this script and says

1. I'll define a class (basically a namespace)
2. Inside the class, I'll DEFINE class.init
3. Another define call; I'll DEFINE class.somefumc
4. Now the init is called by the constructor and the somefunc method is already defined.