How to serialize objects using pickle in python3

Question

I read "How to think like a Computer Scientist. Learning with Python." book. So I usually have no difficulties to interpret examples from python2 to python3, but at chapter 11 Files & Exceptions I encountered this snippet

>>> import pickle >>> f = open("test.pck", "w") >>> pickle.dump(12.3, f) >>> pickle.dump([1,2,3], f) >>> f.close()

which when I evaluate it using Python 3.5.2 gives this error

Traceback (most recent call last): File "/(myDirs)/files.py", line 3, in <module> pickle.dump(3.14, f) TypeError: write() argument must be str, not bytes

I am not a good docs reader, so if you can help me to solve this riddle I would be grateful.

user9849588 · Accepted Answer · 2018-06-12 15:55:34Z

1

You need to open the file in binary mode.

In line 2:

f = open("test.pck", "wb")

answered Jun 12, 2018 at 15:55

user9849588

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