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build UVC driver for Unity

According to this page: https://library.vuforia.com/content/vuforia-library/en/articles/Solution/uvc-camera-driver.html

but I stuck in this step  2.Run python build.py (For more build options, use python build.py --help)

the CMD Terminal feedback : invalid syntax

>>> python build.py --help   File "<stdin>", line 1     python build.py --help                ^

can anybody help me please?