What is the correct ways to write Boto3 filters to use customise tag name?

Question

I am trying to list the instances on tag values of different tag keys For eg> one tag key - Environment, other tag key - Role. My code is given below :

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Answer 1

Fix the Env and Role, as I am not sure mine or mootmoot's answer will work because the Array for Values expects strings.

reservervations = ec2.describe_instances(
        Filters=[
           {'Name': 'tag:environment', 'Values': ['%s'], 'Name': 'tag:role', 'Values': ['%s']} % (Env, Role),
        ]]
    ).get(
        'Reservations', []
    )