#!/scisoft/bin/python

# Script A (script_a.py)

from script_b import my_b_variable, my_b_function

def my_a_function(var):
     my_a_variable = my_b_function(var)
     return my_a_variable

if __name__ == '__main__':
     # this A script is being called from the command line
     # do whatever you like in here, like run a function:
     import sys
     command_line_arg = sys.argv[1]
     print my_a_function(command_line_arg)