#!/usr/bin/env python
# Script: week_4 worksheet
# Author: Scott Frasier
# Purpose: Course work Programming for Investigators.

'''
2. Write a program that converts feet to inches, only positive value of feet is
accepted. (Hint: 1 feet = 12 inches)
'''


def ask_user_for_feet():
    while True:  # Loop until break
        feet = raw_input("How many feet?: ")  # Get feet from user
        try:
            feet = float(feet)  # try to convert feet to a float
            if feet < 0:  # check to make sure value is positive
                raise ValueError  # if not raise error and re-loop
            break  # if in converts then break from the while loop
        except:  # if feet is not a float or integer tell the user and re-loop
            print("feet must be a positive integer or float!")
    return feet


def main():
    print("Enter the number of feet you want converted to inches: ")

    feet = ask_user_for_feet()
    inches = feet * 12.0

    # using .format is more readable and the preferred method in the python
    # documentation
    message = "{} feet converts to {} inches."
    print(message.format(feet, inches))

if __name__ == "__main__":
    main()