[Python-Dev] 2to3 porting HOWTO: setup.py question

[anatoly techtonik]

http://docs.python.org/py3k/howto/pyporting.html#during-installation

What's the point in making implicit Python 3 check here:
try:  # Python 3
  from distutils.command.build_py import build_py_2to3 as build_py
except ImportError:  # Python 2
  from distutils.command.build_py import build_py

instead of explicit check like:
import sys
if sys.version_info[0] >= 3:
    from distutils.command.build_py import build_py_2to3 as build_py

?
--
anatoly t.