# [Tutor] Function problem

Eri Mendz jerimed at myrealbox.com
Fri Nov 5 19:35:53 CET 2004

```Hello All,

First off, thanks again to all who answered my loop problem Re:
'IndexError....'. I got it understood now.

The problem of my script below is in the proceed function: if Y is
selected, instead of staying in the option menu, the program just shows
the option menu then exits. ditto in the 'really quit program' prompt: i
expect to go to main menu if i select N but again program exits. can you
guys point me to my error? this is just a simple script but it took me
some time to figure out on my own; its a good learning exercise
nevertheless.

what to do to improve the program further, e.g., make it simple but
efficient? i love to hear your good advise.

#!/usr/bin/env python
# filename: tempConvert.py
# description: temperature conversion program
# Author: Eri Mendz
# Fri Nov  5 13:53:16 AST 2004

import sys

def print_options():
print '''
THIS IS A TEMPERATURE CONVERSION PROGRAM.
Options:
[C] - convert to Celsius
[F] - convert to Fahrenheit
[P] - print options
[Q] - quit
'''
print_options()

def f2c(ctemp):
return (9/5.0)*ctemp + 32

def c2f(ftemp):
return (ftemp - 32) * 5/9.0

def proceed():
proceed = raw_input("do another conversion? [Y|N]: ")
if proceed == 'y' or proceed =='Y':
print_options()
else:
confirmQuit()

def confirmQuit():
ask = raw_input("Really quit program? [Y|N]: ")
if ask == 'y' or ask == 'Y' or ask == 'ye' or ask == 'yes':
sys.exit("bye")
else:
print_options()

# begin
while 1:
choice = raw_input("select options: ")
if choice == 'c' or choice == 'C':
try:
getftemp = int(raw_input("enter fahrenheit temperature: "))
print "temp in C is: ", c2f(getftemp)
proceed()
except ValueError:
print "error: not a valid input!"
break
elif choice == 'f' or choice == 'F':
try:
getctemp = int(raw_input("enter centigrade temperature: "))
print "temp in F is: ", f2c(getctemp)
proceed()
except ValueError:
print "error: not a valid input!"
break
elif choice =='p' or choice == 'P':
print_options()
elif choice =='q' or choice == 'Q':
confirmQuit()
else:
print "invalid option"

print "bye"

```