What values are accepted for usernames?

[NovaArray]

When I try to run the script

TRecord.py -u <username> -q best -v 1

and I input a username such as "twitchusername" in alphabetical characters, it displays the message

SyntaxError: invalid syntax
File "<stdin>", line 1 

I am not completely familiar with working with python, so I may be making a simple mistake.