Install the usual scientific packages like so:
sudo port install py27-numpy py27-scipy py27-matplotlib py27-ipython +notebook py27-pandas py27-sympy py27-nose
Now ensure that the relevant versions are active:
sudo port select --set python python27
sudo port select --set ipython ipython27
Next install pip and select it as active:
port install py27-pip
port select --set pip pip27