Kristján Valur Jónsson added the comment:

Right, the idea of the version token is to introduce it now, as early as 
possible, even if it is not needed, for prudence.
For example, if version 5 decides to change the semantics of some of the 
opcodes, we can then support both kinds, in the future.  Read old files _and_ 
the new ones.

Despite the fact that we claim that we don't guarantee interoperability, in 
reality it is very desirable.  During development, for instance. Frozen 
modules, .pyc files, and all that.

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<http://bugs.python.org/issue19256>
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