Unicode error

[deedeed]

parser.add_argument('in_file', help='C:\\Users\Biju\Desktop\Python\HST\CANBK5.hst')
parser.add_argument('out_file', help='C:\\Users\Biju\Desktop\Python\HST\a.csv')

Tried the above code ...changed it to single quotes and and double slash. Not working

parser.add_argument('in_file', help='C:/Users/Biju/Desktop/Python/HST/CANBK5.hst')
parser.add_argument('out_file', help='C:/Users/Biju/Desktop/Python/HST/a.csv')

This too not working