Temperature

# This program asks the user to select Fahrenheit or Celsius conversion
# and input a given temperature. Then the program converts the given 
# temperature and displays the result.
#
# References:
#     https://www.mathsisfun.com/temperature-conversion.html
#     https://en.wikibooks.org/wiki/Python_Programming


def get_choice():
    print("Enter C to convert to Celsius or F to convert to Fahrenheit:")
    choice = input()    
    return choice


def get_temperature(label):
    print(f"Enter {label} temperature:")
    temperature = float(input())    
    return temperature


def calculate_celsius(fahrenheit):
    celsius = (fahrenheit - 32) * 5 / 9    
    return celsius


def calculate_fahrenheit(celsius):
    fahrenheit = celsius * 9 / 5 + 32
    return fahrenheit


def display_result(temperature, from_label, result, to_label):
    print(f"{temperature}° {from_label} is {result}° {to_label}")


def main():
    choice = get_choice()
    if choice == "C" or choice == "c":
        temperature = get_temperature("Fahrenheit")
        result = calculate_celsius(temperature)
        display_result (temperature, "Fahrenheit", result, "Celsius")
    elif choice == "F" or choice == "f":
        temperature = get_temperature("Celsius")
        result = calculate_fahrenheit(temperature)
        display_result (temperature, "Celsius", result, "Fahrenheit")
    else:
        print("You must enter C to convert to Celsius or F to convert to Fahrenheit.")


main()

Output

Enter C to convert to Celsius or F to convert to Fahrenheit:
 c
Enter Fahrenheit temperature:
 100
100.0° Fahrenheit is 37.77777777777778° Celsius

Enter C to convert to Celsius or F to convert to Fahrenheit:
 f
Enter Celsius temperature:
 100
100.0° Celsius is 212.0° Fahrenheit

Enter C to convert to Celsius or F to convert to Fahrenheit:
 x
You must enter C to convert to Celsius or F to convert to Fahrenheit.

References

• Wikiversity: Computer Programming