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import sys
def choose_one(choices, prompt):
for idx, choice in enumerate(choices):
print('%d. %s' % (idx + 1, choice))
selected = None
while not selected or selected <= 0 or selected > len(choices):
selected = raw_input(prompt)
try:
selected = int(selected)
except ValueError:
selected = None
return choices[selected - 1]
def error_exit(msg, status=1):
sys.stderr.write('Error: %s\n' % msg)
sys.exit(status)
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