Serialization, pickling - 직렬화

python - pickle, serialization

pickle

pickle은 python object를 가져와서 문자열표현으로 변환한다

pickling(serialization) : object -> bytes
unpickling(deserialization) : bytes -> object

>>> import pickle
>>> class Rectangle:
...     def __init__(self, width, height):
...             self.width=width
...             self.height = height
...             self.area = width * height
...
>>> rect = Rectangle(10, 20)
>>> type(rect)
<class '__main__.Rectangle'>

# pickling
>>> a=pickle.dumps(rect)
>>> a
b'\x80\x03c__main__\nRectangle\nq\x00)\x81q\x01}q\x02(X\x05\x00\x00\x00widthq\x03K\nX\x06\x00\x00\x00heightq\x04K\x14X\x04\x00\x00\x00areaq\x05K\xc8ub.'
>>> type(a)
<class 'bytes'>

# unpickling
>>> b=pickle.loads(a)
>>> b
<__main__.Rectangle object at 0x10d7a7b00>
>>> type(b)
<class '__main__.Rectangle'>

>>> b.area
200