Temperature converter

tempconv.py

#!/usr/bin/python 

# Simple Temperature Converter Written in Python  
# License: Public Domain
# Usage: conv input_unit value 
# Usage example: tempconv F 32
 
import sys 
 
#Welcome
tcversion = 1.0
print 'TempConv v. {} '.format(tcversion) 
print 'Simple temperature converter tool'
print '\r\r'
 
 
# Functions
def fconv(finput): 
	coutput = (((finput - 32) * 5) / 9)
	koutput = coutput + 273.15
	routput = finput + 459.67  
	print '{} degrees Fahrenheit converts to: '.format(finput)
	print '\r'
	print 'Celsius: {}'.format(coutput)
	print 'Kelvin: {}'.format(koutput)
	print 'Rankine: {}'.format(routput)
 
def cconv(cinput):
	foutput = (((cinput * 9) / 5) + 32)
	koutput = cinput + 273.15
	routput = foutput + 459.67
	print '{} degrees Celsius converts to: '.format(cinput)
	print '\r'
	print 'Fahrenheit: {}'.format(foutput)
	print 'Kelvin: {}'.format(koutput)
	print 'Rankine: {}'.format(routput) 
 
def kconv(kinput):
	coutput = kinput - 273.15
	foutput = (((coutput * 9) / 5) + 32)
	koutput = coutput + 273.15 
	routput = foutput + 459.67 
	print '{} degrees Kelvin converts to: '.format(kinput)
	print '\r'
	print 'Fahrenheit: {}'.format(foutput)
	print 'Celsius: {}'.format(coutput)
	print 'Rankine: {}'.format(routput) 
 
 
def rconv(rinput):
	foutput = rinput - 459.67 
	coutput = (((foutput - 32) * 5) / 9)
	koutput = coutput + 273.15 
	print '{} degrees Rankine converts to: '.format(rinput)
	print '\r'
	print 'Fahrenheit: {}'.format(foutput)
	print 'Celsius: {}'.format(coutput)
	print 'Kelvin: {}'.format(koutput) 
 
# Main
if len(sys.argv) != 3:
	sys.exit("You must enter input in the correct format.") 
 
 
if sys.argv[1] in ['F', 'f', 'Fahrenheit', 'fahrenheit']:
	#Convert from Fahrenheit 
	fval = float(sys.argv[2])
	fconv(fval)
 
if sys.argv[1] in ['C', 'c', 'Celsius', 'celsius']:
	#Convert from Celsius 
	cval = float(sys.argv[2])
	cconv(cval)
 
if sys.argv[1] in ['K', 'k', 'Kelvin', 'kelvin']:
	#Convert from Kelvin
	kval = float(sys.argv[2])
	kconv(kval)
 
if sys.argv[1] in ['R', 'r', 'Rankine', 'rankine']:
	#Convert from Rankine
	rval = float(sys.argv[2])