Python TypeError: an integer is required weird

Question

wally=pickle.load(open("The Wall.txt","rb"))
usernamey=pickle.load(open("username1.txt","rb"))
wu=("\n", wally, "\n", usernamey, "\n")
apost=input("Enter your post below: \n")
pwickle=pickle.dump(wu, apost, open("The Wall.txt","wb"))

Don't know why this isn't working, comes up with error message:

pwickle=pickle.dump(wu, apost, open("The Wall.txt","wb"))

TypeError: an integer is required

Answer 1

As unutbu pointed out, the third argument is the protocol. You should group all the objects you want to pickle in a tuple like this:

pwickle=pickle.dump((wu, apost), open("The Wall.txt","wb"))

If you need to pickle a larger amount of data, you could use the shelve module that operates like a dictionary.

By the way, the files pickle creates are binary (or at least not human readable, depends on the protocol), so I wouldn't name them .txt . .db , .pickle or something like that would be better.

Answer 2

第三个参数指定协议，协议应为整数，0、1或2。