[Tutor] Input handling?

[Scott Yamamoto]

I've been trying to find possible erros with input(such as NameError or SyntaxError) to handle them with an except clause. however, I've found that hitting enter/return while prompted without inputting creates some kind of problem.
>>>username = raw_input("Input a username: ")
Input a username: #hits enter, encounter problem here. Loops forever or something

Using python for ios
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