get_policies.py

import boto3

profile_name = 'dev'
role_name = 'test-role'

session = boto3.Session(profile_name=profile_name)
iam = session.client('iam')

def get_policies_for_role(rolename):
    all_policies = {}
    
    # two possible types of policies - inline and managed
    inline_policies = iam.list_role_policies(RoleName=rolename)['PolicyNames']
    attached_policies = iam.list_attached_role_policies(RoleName=rolename)['AttachedPolicies']

    # Get each inline policy
    for policy in inline_policies:
        all_policies[policy] = iam.get_role_policy(
            RoleName=rolename,
            PolicyName=policy)['PolicyDocument']
    
    # Get the default VersionId, then use that to retrieve that version of the policy.
    for policy in attached_policies:
        policy_version = iam.get_policy(
            PolicyArn=policy['PolicyArn']
        )['Policy']['DefaultVersionId']

        all_policies[policy['PolicyArn']] = iam.get_policy_version(
            PolicyArn=policy['PolicyArn'],
            VersionId=policy_version
            )['PolicyVersion']['Document']

    return all_policies