remove version 2.3 requirement -- modify setup.py 'if sys.version_info[:2] < (2, 3):' to be 'if sys.version_info[:2] < (2, 2):'

remove package dependency -- Two c source files from Bio.Nexus and Bio.Restriction.DNAUtils need python2.3 only stuff, i.e. PyMODINIT_FUNC. So just comment out related directives in setup.py:

yuhuang@hpc-cmb:~/lib/biopython/biopython-1.41$ diff setup.py setup.orig.py
355a356
>     'Bio.Nexus',
436a438,443
>     Extension('Bio.Nexus.cnexus',
>               ['Bio/Nexus/cnexus.c']
>               ),
>     Extension('Bio.Restriction.DNAUtils',
>               ['Bio/Restriction/DNAUtils.c']
>               ),

install -- python setup.py install --home=~/lib/biopython/

move directory -- mv ~/lib64/python/* ~/lib/biopython/