Python: saving objects and using pickle. Error using pickle.dump

Question

Hello I have an Error and I don´t the reason:

>>> class Fruits:pass
...
>>> banana = Fruits()
>>> banana.color = 'yellow'
>>> banana.value = 30
>>> import pickle
>>> filehandler = open("Fruits.obj",'w')
>>> pickle.dump(banana,filehandler)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "C:\Python31\lib\pickle.py", line 1354, in dump
Pickler(file, protocol, fix_imports=fix_imports).dump(obj)
TypeError: must be str, not bytes
>>>

I don´t know how to solve this error because I don´t understand it. Thank you so much.

works for me. Was the namespace somehow polluted before this? — Andrew Jaffe
– Andrew Jaffe, Commented Dec 25, 2010 at 13:03
@Andrew Jaffe:Sorry...I don´t understand you...what do you mean? — Peterstone
– Peterstone, Commented Dec 25, 2010 at 13:11
Does it work if these are the very first things that you do in a python session? — Andrew Jaffe
– Andrew Jaffe, Commented Dec 25, 2010 at 13:26
I corrected it based on the answer below and now it works, but I don´t still how to load my objects. — Peterstone
– Peterstone, Commented Dec 25, 2010 at 14:29

ismail · Accepted Answer · 2010-12-25 13:11:56Z

3

You have to open your filehandler in binary mode, use wb instead of w:

filehandler = open(b"fruits.obj","wb")

answered Dec 25, 2010 at 13:11

ismail

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