Demonstrates how to use methods in a program.

temp_converter.py

#I McTavish
#Nov 2, 2016
#Demonstrate methods with temp convertor

def convert_c_to_f(c):
    """Method to convert Celsius to Fahrenheit
    Pre: Celsius temp
    Post: Fahrenheit temp"""
    f = 9/5*c+32
    return format(f,".2f")


def convert_f_toc(f):
    """Method to convert Fahrenheit to Celsius
    Pre:  Fahrenheit emp
    Post: Celsius temp"""
    c = 5/9*(f-32)
    return format(c,".2f")

#Main Program
"""Loop until user enters q to quit - get temp and convert"""
user_input = input("Pick a choice: \n1 - convert C to F\n2 - convert F to C\n3 - Quit\n")
while user_input != "3":
    if user_input == "1":
        temp_c = input("Enter a temperature in Celcius\n")
        if str.isdecimal(temp_c):
            print("In fahrenheit:",convert_c_to_f(float(temp_c)))
        else:
            print("Sorry, a number must be provided.")
    elif user_input == "2":
        temp_f = input("Enter a temperature in Fahrenheit\n")
        if str.isnumeric(temp_f):
            print("In Celsius:",convert_f_toc(float(temp_f)))
        else:
            print("Sorry, a number must be provided.")
    else:
        print("Not a valid choice.")
    user_input = input("Pick a choice: \n1 - convert C to F\n2 - convert F to C\n3 - Quit\n")