It is not a very simple process to call EASI functions from python. You will basically have to run the EASI script using subprocess.call() function. However, if you need to pass variables to it, you may need to use python to directly edit the EASI script file. using the with open() as file: method.
for more information about the subprocess.call function, see http://stackoverflow.com/questions/204017/how-do-i-execute-a-program-from-python-os-system-fails-due-to-spaces-in-path
With all that being said, many of the EASI intrinsic functions can be replaced by using our new Python platform API and functions available in python or numpy.
Our python api is available at: http://www.pcigeomatics.com/python-api-doc/
Perhaps if you give me some more detail about some of the intrinsic functions you wish to convert to python, I can give more direction.