Python_ValueError:need more than 1 value to unpack

from sys import argv
script,user_name=argv
prompt='>'

print "Hi %s,I'm the %s script."%(user_name,script)
print "I'd like to ask you a few questions."
print "Do you like me %s?"%user_name
likes=raw_input(prompt)
print "Where do you live %s?"%user_name
lives=raw_input(prompt)
print "What kind of computer do you have?"
computer=raw_input(prompt)
print """Allright, so you said %r about liking me.You live in %r.Not sure where
that is.And you hava a %r computer.Nice."""%(likes,lives,computer)

直接运行以上