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```def c2f(t):
return (t*9/5.0)+32

def c2k(t):
return t+273.15

def f2c(t):
return (t-32)*5.0/9

def f2k(t):
return (t+459.67)*5.0/9

def k2c(t):
return t-273.15

def k2f(t):
return (t*9/5.0)-459.67

def get_user_input():

user_input = 0
while type(user_input) != type(1.0):
user_input = raw_input("Enter degrees to convert: ")
try:
user_input = float(user_input)
except:
print user_input + " is not a valid entry"
return user_input

def main():

"1. Celsius to Fahrenheit\n"+\
"2. Celsius to Kelvin\n"+\
"3. Fahrenheit to Celsius\n"+\
"4. Fahrenheit to Kelvin\n"+\
"5. Kelvin to Celsius\n"+\
"6. Kelvin to Fahrenheit\n"+\
"7. Quit"

user_input = 0
while user_input != 7:
user_input = raw_input("Please enter a valid selection: ")

try:
user_input = int(user_input)
except:
print user_input + " is not a valid selction, please try again\n"

if user_input == 1:
t = get_user_input()
print str(t) + " degree Celsius is " + str((c2f(t))) + " degree Fahrenheit"
elif user_input == 2:
t = get_user_input()
print str(t) + " degree Celsius is " + str((c2k(t))) + " degree Kelvin"
elif user_input == 3:
t = get_user_input()
print str(t) + " degree Fahrenheit is " + str((f2c(t))) + " degree Celsius"
elif user_input == 4:
t = get_user_input()
print str(t) + " degree Fahrenheit is " + str((f2K(t))) + " degree Kelvin"
elif user_input == 5:
t = get_user_input()
print str(t) + " degree Kelvin is " + str((k2c(t))) + " degree Celsius"
elif user_input == 6:
t = get_user_input()
print str(t) + " degree Kelvin is " + str((k2f(t))) + " degree Fahrenheit"
elif user_input == 7:
quit()
else:
print str(user_input) + " is not a valid selection, please try again\n"

if __name__ == "__main__":
main()
```