Just playing around with the class init method and its return values

classinitnone.py

# -*- conding: uft-8 -*-

"""Just playing around with the class init method."""


class InitReturnNone():
    def __init__(self, var):
        self.var = var
        return None


init_return_none = InitReturnNone("B")
print(init_return_none)
print(init_return_none.var)

classinitnormal.py

# -*- conding: uft-8 -*-

"""Just playing around with the class init method."""


class Normal():
    def __init__(self, var):
        self.var = var


normal = Normal("A")
print(normal)
print(normal.var)

classinitraise.py

# -*- conding: uft-8 -*-

"""Just playing around with the class init method."""


class InitRaises():
    def __init__(self, var):
        self.var = var
        raise NotImplementedError("Don't do this.")


init_raises = InitRaises("E")
print(init_raises)
print(init_raises.var)

classinitself.py

# -*- conding: uft-8 -*-

"""Just playing around with the class init method."""


class InitReturnSelf():
    """
    Raises error.

    Traceback (most recent call last):
        File "classinit.py", line 33, in <module>
            init_return_self = InitReturnSelf("C")
    TypeError: __init__() should return None, not 'InitReturnSelf'
    """
    def __init__(self, var):
        self.var = var
        return self


init_return_self = InitReturnSelf("C")
print(init_return_self)
print(init_return_self.var)

classinitstring.py

# -*- conding: uft-8 -*-

"""Just playing around with the class init method."""


class InitReturnString():
    """
    Raises error.

    Traceback (most recent call last):
        File "classinit.py", line 32, in <module>
            init_return_string = InitReturnString("C")
    TypeError: __init__() should return None, not 'str'
    """
    def __init__(self, var):
        self.var = var
        return "Some String"


init_return_string = InitReturnString("D")
print(init_return_string)
print(init_return_string.var)