Try putting this in your .bash_profile instead:
# Setting PATH for EPD_free-7.3-2
# The orginal version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/Current/bin:/Users/LMS/Documents/pydata-book:/Users/LMS/Documents/python_scripts:${PATH}"
export PATH
Basically, you put the directories that contain the executable files you want, separated by ':'