在Python中使用pickle.dump

Question

我正在尝试学习如何pickle在Python中使用该模块:

import pickle
x = 123
f = open('data.txt','w')
pickle.dump(x,f)

这是我得到的:

Traceback (most recent call last):
  File "D:\python\test.py", line 5, in <module>
    pickle.dump(x,f)
TypeError: must be str, not bytes

但是,这段代码工作得很好:

import pickle
dump = pickle.dump(123)
print(dump)

我究竟做错了什么？

Answer 1

问题是您在文本模式下打开文件.你需要在这里使用二进制文件:

>>> f = open('data.txt','w')
>>> pickle.dump(123,f)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: must be str, not bytes
>>> 
>>> f = open('data.txt','wb')
>>> pickle.dump(123,f)
>>>