Simple rules engine in python using eval and exec

rules.py

#!/usr/local/bin/python3

rules = [
    [
        # A required field and default value
        'not "replication_factor" in configuration',
        'configuration["replication_factor"] = 1'
    ],
    [
        # production environments require at least 6 partitions
        'metadata["environment"] == "production" and configuration["num_partitions"] <= 6',
        'configuration["num_partitions"] = 6'
    ],
    [
        # non-prod environments require at least 3 partitions
        'metadata["environment"] != "production" and configuration["num_partitions"] <= 3',
        'configuration["num_partitions"] = 3 '
    ],
    [
        # topic names must be at least 5 characters in length
        'len(configuration["topic"]) < 5',
        'raise Exception("Topic name is too short")'
    ],
    [
        # topic names must start with the team
        'not configuration["topic"].startswith(metadata["team"])',
        'configuration["topic"] = "%s.%s"%(metadata["team"],configuration["topic"])'
    ],
    [
        # WARNING: This approach is a security risk! Something like this can delete files!
        'True',
        'open("rules.txt","w")'
    ]
]

def apply_rules(rules, config):
    for rule, action in rules:
        e = eval( rule, {}, { 'metadata':config["metadata"], 'configuration': config["configuration"] })
        if e:
            exec( action, {}, { 'metadata':config["metadata"], 'configuration': config["configuration"] })

# Some examples
config1 = {
    "action": "CREATE",
        "configuration":
        {
            "topic": "event_streaming_101",
            "num_partitions": 3,
            "replication_factor": 5
        },
        "metadata":
        {
            "environment": "production",
            "domain": "highered",
            "team": "avengers",
            "project": "2022-midyear"
        }
}

print("\n#1 user supplied configuration")
print(config1)
try:
    apply_rules(rules, config1)
    print("#1 implemented configuration")
    print(config1)
except Exception as e:
    print("#1 not implemented")
    print(e)


config2 = {
    "action": "CREATE",
        "configuration":
        {
            "topic": "event_streaming_101",
            "num_partitions": 3
        },
        "metadata":
        {
            "environment": "development",
            "domain": "highered",
            "team": "avengers",
            "project": "2022-midyear"
        }
}

print("\n#2 user supplied configuration")
print(config2)
try:
    apply_rules(rules, config2)
    print("#2 implemented configuration")
    print(config2)
except Exception as e:
    print("#2 not implemented")
    print(e)


config3 = {
    "action": "CREATE",
        "configuration":
        {
            "topic": "this",
            "num_partitions": 6
        },
        "metadata":
        {
            "environment": "production",
            "domain": "highered",
            "team": "avengers",
            "project": "2022-midyear"
        }
}

print("\n#3 user supplied configuration")
print(config3)
try:
    apply_rules(rules, config3)
    print("#3 implemented configuration")
    print(config3)
except Exception as e:
    print("#3 not implemented")
    print(e)