# cubeMyNumberV2.py
# Purpose: Cube input value
#   or print traceback message.
# Usage: numeric_value
# Example input: 5
import sys, traceback
try:
    number = float(sys.argv[1])
    cube = number**3
    print('The cubed number is {0}'.format())  # missing arg
except:
    print('Input must be numerical.')
    traceback.print_exc()
print('Good bye!')