my function isn't returning anything in python

my function isn't returning anything in python

References

Reference NO 1

http://stackoverflow.com/questions/11485999/python-function-isnt-returning-variable

Reference NO 2

http://stackoverflow.com/questions/18278405/python-3-3-cant-get-a-function-to-return-anything-other-than-none

Reference NO 3

http://stackoverflow.com/questions/17631205/when-do-you-write-function-that-doesnt-return-anything

Reference NO 4

http://stackoverflow.com/questions/15149667/functions-and-if-else-in-python-codeacademy

Reference NO 5

http://stackoverflow.com/questions/3881434/difference-between-returns-and-printing-in-python

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#