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How to Evaluate IAM Policy Allow vs Deny in Python

Evaluate an AWS-style IAM policy dict with explicit deny overriding allow and default deny.

iam aws policy-evaluation
Python 
import json


def evaluate_policy(action, resource, policy):
    """Evaluate an IAM-like policy dict.
    Explicit deny wins over allow. Default is deny.
    """
    for statement in policy.get("Statement", []):
        effect = statement.get("Effect")
        actions = statement.get("Action", [])
        resources = …
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