python - python中pickle.dump的使用

Question

我正在尝试学习如何在 Python 中使用 pickle 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，这段代码可以正常工作:

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

我做错了什么？

Answer 1

问题是您以文本模式打开文件。你需要在这里使用二进制:

>>> 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)
>>>