'''
	Module m1
'''
#!/usr/bin/python

def f_1():
    '''
        Function f_1 in module m1
    '''
    print("f_1  ...")

def f_2():
    '''
        Function f_2 in module m1
    '''
    print("f_2 ...")

def main():
    f_1()
    f_2()

if __name__ == "__main__":
    main()
		

'''Import a whole module'''

import m1
----------------------
m1.f_1()
m1.f_2()
m1.main()

'''Import the functions in a module'''

from m1 import *
----------------------
f_1()
f_2()
main()

'''Import a specific function from a module'''

from m1 import main
-----------------------
main()

The current directory

PYTHONPATH

• PYTHONPYTH="${PYTHONPATH}:/yourPath/"
  export PYTHONPATH
• import sys
  sys.path.append(yourPath)

Installation-dependent default

Python Tutorial