Python Python Magic Method (pending pits)

Reference post: http://pyzh.readthedocs.io/en/latest/python-magic-methods-guide.html

Reference Blog English Original: http://www.rafekettler.com/magicmethods.html

Construction Method:

1, __new__: The first call, remove the CLS parameter, and pass all other parameters to __init__, only applicable to the inheritance unchanged analogy such as int, tuple,string.

2. __init__: Initialization method

3. __DEL__: Destroy the object, for example, when the object is destroyed by closing the open file.

Comparison operators:

1, __cmp__: If all the comparison standards are unified, can be achieved through this implementation, otherwise you have to implement other comparison operators in turn. (Self>other returns 1)

2, __eq__, __ne__, __lt__, __gt__, __le__, __ge__: =,! =, <,;, <=, >=

3, Functools has a class decorator, as long as the definition of __eq__ and another operator, you can help to implement the comparison method, @total_ordering.

Numeric operator: unary

1, __pos__: Take positive

2, __neg__: Take negative

3. __abs__: Absolute Value

4, __invert__: Take the inverse operator ~

5, __round__: approximate number of digits

6. __floor__: Rounding Down

7, __ceil__: Rounding up

8, __trunc__: Take the distance 0 nearest integer

Number operator: two Yuan

1, __add__

2, __sub__

3, __mul__

4, __floordiv__://

5, __div__:/

6, __mod__

7, __divmod__

Python Python Magic Method (pending pits)