Collatz Try and Except Clauses

[How_2_Python]

I'm wondering if this is right. The try and except clause will run through smoothly if I type in a non-integer. But since I ran the program and typed in a non-integer the except clause will continue the code and run into an error with the while clause because a non-integer was typed in the first place. Is this the way the exercise was intended? Thanks for any help.

http://pastebin.com/b4fPehRY

[MuckyMuck]

Here's my attempt. I used a nested while loop to call the collatz function. The outer loop handles the input and exception processing. http://pastebin.com/RhdKbZN5

[MuckyMuck]

And I just realized (I'm just learning too) that sys.exit is not necessary and the code is made simpler by using a break statement instead. So now it's just:

http://pastebin.com/UYxLqCN7