NameError: name 'C' is not defined` error Converting Temperature

I'm working on this python code to convert Fahrenheit to Celsius and second code that converts Celsius to Fahrenheit. I wrote each code the same way, using (if/else) but whenever I try to make the first condition true. For example, when temperature F = -400 I get a NameError: name 'C' is not defined error.

I tried changed the line position for C so it runs before the last print line. But still no luck. The second code part that converts C to F runs without this error. I tried putting the equation for C after the last print line but still the same error.

Is this something that I may be missing on the first part that may be preventing me from making the first condition true?

I'm running Python 2.7.10 and using Terminal on Mac OS X El Capitan (10.11)

    F = int(raw_input("Enter Temperature In Fahrenheit:")) 

    if F >= (-459.67):

        print "Temperature in absolute zero cannot be achieved"

    else: 

        C = F - 32 * (0.555556) 
    print "The temperature is %.1f" 'C'  % C 

----------------------------------------------------------

C = int(raw_input("Enter Temperature In Celsius:"))

if C <= (-273.15):   

    print "Temperature in absolute zero cannot be achieved" 

else:                                                        

    print "The temperature is %.1f" 'F' % F                 
F = C * (1.8) + 32