readtime.py

## 
#  This program demonstrates a reusable function.
#  

def main():
    print("Please enter a time: hours, then minutes.")
    hours = read_int_between(0, 23)
    minutes = read_int_between(0, 59)
    print("You entered %d hours and %d minutes." % (hours, minutes))


def read_int_between(low, high):
    """
    Prompts a user to enter a value within a given range until the user provides  a valid input.

    :param low: an integer indicating the smallest allowable input
    :param high: an integer indicating the largest allowable input
    :return: the integer value provided by the user (between low and high, inclusive)
    """
    value = int(input("Enter a value between " + str(low) + " and " +
                      str(high) + ": "))
    while value < low or value > high:
        print("Error: value out of range.")
        value = int(input("Enter a value between " + str(low) + " and " +
                          str(high) + ": "))

    return value


# Start the program.
main()