Why devel/py-pip provides pip only for python2.7?

[Daniil Berendeev]

devel/py-pip installs pip as

~> which pip-2.7
/usr/local/bin/pip-2.7

But also it adds
~> which pip
/usr/local/bin/pip

that is
~> ll /usr/local/bin/pip
lrwxr-xr-x  1 root  wheel  22 11 февр. 12:33 /usr/local/bin/pip ->
/usr/local/bin/pip-2.7

so, we get:
~> pip -V
pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)
~> pip-2.7 -V
pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)

What is the point of this layout?
It's sad that there is no pip for python3.x in ports.
Why is it not ported?
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