第32课关于pickle的问题

syf040916

我试图用pickle创建一个.json文件，然后用json去load,但是出现了编码的错误
>>>import pickle as p
>>>import json as j
>>>b='{"y":1,"c":2}'
>>>f=open('test.json','wb')
>>>p.dump(b,f)
>>>f.close()
>>>j.load(f)
Traceback (most recent call last):
  File "<pyshell#73>", line 1, in <module>
    j.load(f)
  File "D:\Programme\Python\lib\json\__init__.py", line 300, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
  File "D:\Programme\Python\lib\json\__init__.py", line 350, in loads
    s = s.decode(detect_encoding(s), 'surrogatepass')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 0: invalid start byte
于是，我尝试不用二进制'b'去编码，结果还是报错
>>>import pickle as p
>>>import json as j
>>>b='{"y":1,"c":2}'
>>>f=open('test.json','w')
>>>p.dump(b,f)
Traceback (most recent call last):
  File "<pyshell#78>", line 1, in <module>
    p.dump('{"y":1,"c":2}',f)
TypeError: write() argument must be str, not bytes
但type(b) 明显是str, 为什么会报这样的错误？ 最后用pickle创建.json , 用json.load() 去把字符串中的字典提取出来，应该怎么做？谢谢

heidern0612

>f=open('test.json','w')

错误提示你只能写入str，不能写入字节。

syf040916

'{"y":1,"c":2}' 显然是str啊，就算dump的是 '123'， 不是'{"y":1,"c":2}'   也会报这个错误。