I can't seem to understand how to input tempUnits=tempUnits.upper() so that the user can put upper and lower case F
tempUnits = input("Enter the units of temperature, C for celsius, F for fahrenheit ")
if tempUnits =='F':
tempUnits=tempUnits.upper()
temp = float(input("Input the temperature of water in degrees fahrenheit(°F) "))
temp = (temp - 32) * 5/9
else:
temp = float(input("Enter the current temperature of the water Celsius(°C) "))
if temp <= 0:
print("Temperature in celsius must be above zero degrees, or above 32 fahrenheit")
else:
