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Wed Feb 4 16:05:12 EST 2004 · https://mail.python.org/pipermail/python-dev/2004-February/042410.html

> I just ran across something that looks like a very unfortunate interface
> change in the pickle module:
> 
> Python 2.2:  dump(object, file[, bin])
> Python 2.3:  dump(object, file[, protocol[, bin]])
> 
> ...and indeed I have code, which uses pickle.dump(obj, f, True).
> 
> Hmm, ok, so probably this means now (under python 2.3) I'm using
> protocol number 1 (==True)?!  Tricky. :-)  Maybe that warrants a comment
> in the docs?

Are you sure you aren't misreading the docs?

The number of arguments is the same.  It's just that what was a
boolean in 2.2 is an int in 2.3.  IOW, protocol 0 is the old "text"
protocol, protocol 1 is the old "binary" protocol, and protocol 2 is
a new protocol introduced in Python 2.3.  And indeed, 0==False,
1==True.

--Guido van Rossum (home page: http://www.python.org/~guido/)

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[Python-Dev] pickle.dump(..) interface change ... documentation