[Python] I am not able to pass parameter in aws batch job?

I have a Dockerfile with the following lines:

FROM python
COPY sysargs.py /
CMD python sysargs.py --date Ref::date



And my python file sysargs.py looks like this:

import sys
print('The command line arguments are:')
a = sys.argv[1]
print(a)


I just want to pass parameter date and print the date but after passing date value I am getting output as "Ref::date".

Can someone help me what I have done wrong?

I am trying to replicate as mentioned in how to retrieve aws batch parameter value in python?.

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