When using the arguparse parameter list, if a parameter specifies a default value, it still displays: error: the following arguments are required
Solution:
1. Replace required=True with required=False.
2. Add — before parameter name.
As follows:
parser.add_argument('--mode', '-M', dest='mode', action='store', required=True,
choices=['train', 'test'], default='train',
help='Mode in which the script is executed.')
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