Here is an example:

```
# class.py
class MyString:
    def __init__(self, str):
        self.str = str
    def __div__(self, sep):
        return self.str.split(sep)

>>> m = MyString('abcdabcdabcd')
>>> print m / 'b'
['a', 'cda', 'cda', 'cd']

```

The `__init__` method takes two parameters: the first one, `self`, is the instance object itself and `str`, the second, is a parameter passed in by the call. Is using `__init__` the only way to get values into the instance of my class? 

Or, if I don't declare the method `__init__`, will expressions like `m = MyString('abcdabcdabcd')` cease to work?