https://pypi.python.org/pypi/

may be setup these 

export CFLAGS="-arch i386 -arch x86_64"

export FFLAGS="-m32 -m64"

export LDFLAGS="-Wall -undefined dynamic_lookup -bundle -arch i386 -arch x86_64"

export CC=gcc

export CXX="g++ -arch i386 -arch x86_64"

brew install gfortran

1. setup python3.4 using dmg files

2. build dependent package

All package download from https://pypi.python.org/pypi/

atlas (0.27.0)

Cython (0.20.1)

freetype-py (0.4.1)

ipython (2.0.0)

matplotlib (1.3.1)

nose (1.3.1)

pip (1.5.4)

pyparsing (2.0.2)

python-dateutil (2.2)

setuptools (3.4.4)

six (1.6.1)

tornado (3.2)

and using these commands

python setup.py build

sudo python setup.py install

Then using brew install gfortan

3. build machine learning package

numpy (1.8.1)

scipy (0.13.3)

scikit-learn (0.15-git)

and using these commands

python setup.py build

sudo python setup.py install

ref:

http://www.newcenturygroup.cn/search/blog.hyperjeff.net/?p=160-numpy%20user%20guide-2.html

http://stackoverflow.com/questions/23095915/installing-scikit-learn-in-mac-wrong-xcode-detected

http://blog.csdn.net/memray/article/details/12325377

http://thismodernphysics.wordpress.com/2014/01/16/installing-python/