pickle 實現序列化和反序列化。
protocol = 0, 用ASCII，protocol=1, 用 二進制。
>>> import pickle as P # python 3
1.pickle.dump(obj, file, protocol=None, *, fix_imports=True)
write a pickled representation of object to the open file object file.
>>> a1='app'
>>> b1 = {1:"One", 2:"Two", 3:"Three"}
>>> c=['dss','dc','dsd']
>>> f = open(file='/home/hushch/圖片/write.txt', mode='wb')
# 創建一個文件用來存儲數據
>>> P.dump(a1,file=f) # 每次添加一個obj到file中
>>> P.dump(b1,file=f)
>>> P.dump(c,file=f)
>>> f.close() # 完成後關閉
2. pickle.load(file, *, fix_imports=True, encoding='ASCII', errors='strict')
read and return an obj from the pickle data stored in a file.
>>> f = open(file='/home/hushch/圖片/write.txt', mode='rb')
>>> a2=P.load(f)
>>> print(a2)
app
>>> b2 = P.load(f)
>>> b2
{1: 'One', 2: 'Two', 3: 'Three'}
>>> c1 = P.load(f)
>>> c1
['dss', 'dc', 'dsd']
>>> f.close()
3. pickle.dumps(obj, protocol=None, *, fix_imports=True)
>>> P.dumps(obj=("this is a string", 42, [1,2,3], None), protocol=0, fix_imports=True)
b'(Vthis is a string\np0\nL42L\n(lp1\nL1L\naL2L\naL3L\naNtp2\n.'
>>> P.dumps(obj=("this is a string", 42, [1,2,3], None), protocol=1, fix_imports=True)
b'(X\x10\x00\x00\x00this is a stringq\x00K*]q\x01(K\x01K\x02K\x03eNtq\x02.'
Return the pickled representation of the object as the bytes object.
4.pickle.loads(data, *, fix_imports=True, encoding='ASCII', errors='strict')
Read and return an obj from the given pickle data.
>>> t=("this is a string", 42, [1,2,3], None)
>>> a = P.dumps(obj=t, protocol=0)
>>> print(a)
b'(Vthis is a string\np0\nL42L\n(lp1\nL1L\naL2L\naL3L\naNtp2\n.'
>>> b = P.loads(data=a)
>>> print(b)
('this is a string', 42, [1, 2, 3], None)
>>> a = P.dumps(obj=t, protocol=1)
>>> print(a)
b'(X\x10\x00\x00\x00this is a stringq\x00K*]q\x01(K\x01K\x02K\x03eNtq\x02.'
>>> b = P.loads(data=a)
>>> b
('this is a string', 42, [1, 2, 3], None)
不同格式間的變化很方便。