Source distributions and Windows installers for Biopython 1.63 beta are now available from the downloads page on the official Biopython website.
This is a beta release for testing purposes, the main reason for a beta version is the large amount of changes imposed by the removal of the 2to3 library previously required for the support of Python 3.X. This was made possible by dropping Python 2.5 (and Jython 2.5).
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