Why doc call `__init__` as a method rather than function?

[scruel tao]

```python
>>> class A:
...   def __init__(self):
...     pass
...
>>> A.__init__
<function A.__init__ at 0x0000026CFC5CCEE0>
>>> a = A()
>>> a.__init__
<bound method A.__init__ of <__main__.A object at 0x0000026CFC1BB400>>
```

On many books and even the official documents, it seems that many authors prefer to call `__init__` as a "method" rather than a "function".
The book PYTHON CRASH COURSE  mentioned that "A function that’s part of a class is a method.", however, ` A.__init__` tells that `__init__` is a function...

I wonder how can I call `__init__` as? Consider the output above.
Maybe both are OK? If you prefer or think that we must use one of the two, please explain the why, I really want to know, thanks!