[FIXED] Cannot (always) fetch an attribute in an object even though it exists

Issue

I'm currently developing locally an Azure function that communicates with Microsoft Sentinel, in order to fetch the alert rules from it, and more specifically their respective querys :

credentials = AzureCliCredential()
alert_rules_operations = SecurityInsights(credentials, SUBSCRIPTION_ID).alert_rules
list_alert_rules = alert_rules_operations.list(resource_group_name=os.getenv('RESOURCE_GROUP_NAME'), workspace_name=os.getenv('WORKSPACE_NAME'))

The issue is that when I'm looping over list_alert_rules, and try to see each rule's query, I get an error:

Exception: AttributeError: 'FusionAlertRule' object has no attribute 'query'.

Yet, when I check their type via the type() function:

list_alert_rules = alert_rules_operations.list(resource_group_name=os.getenv(
        'RESOURCE_GROUP_NAME'), workspace_name=os.getenv('WORKSPACE_NAME'))
for rule in list_alert_rules:
     print(type(rule))
##console: <class 'azure.mgmt.securityinsight.models._models_py3.ScheduledAlertRule'>

The weirder issue is that this error appears only when you don't print the attribute. Let me show you:

• Print:

for rule in list_alert_rules:
     query = rule.query
     print('query', query)
##console: query YAY I GET WHAT I WANT

• No print:

for rule in list_alert_rules:
     query = rule.query
        ...
##console: Exception: AttributeError: 'FusionAlertRule' object has no attribute 'query'.

I posted the issue on the GitHub repo, but I'm not sure whether it's a package bug or a runtime issue. Has anyone ran into this kind of problems?

BTW I'm running Python 3.10.8

TIA!

EDIT: I've tried using a map function, same issue:

def format_list(rule):
    query = rule.query
    # print('query', query)
    # query = query.split('\n')
    # query = list(filter(lambda line: "//" not in line, query))
    # query = '\n'.join(query)
    return rule

def main(mytimer: func.TimerRequest) -> None:
    # results = fetch_missing_data()
    credentials = AzureCliCredential()
    alert_rules_operations = SecurityInsights(
        credentials, SUBSCRIPTION_ID).alert_rules
    list_alert_rules = alert_rules_operations.list(resource_group_name=os.getenv(
        'RESOURCE_GROUP_NAME'), workspace_name=os.getenv('WORKSPACE_NAME'))
    list_alert_rules = list(map(format_list, list_alert_rules))

Solution

Sorry for the late answer as I've been under tons of work these last few days.

Python has an excellent method called hasattr that checks if the object contains a specific key. I've used it in the following way:

for rule in rules:
    if hasattr(rule, 'query'):
       ...

The reason behind using this is because the method returns object of different classes, however inherited from the one same mother class.

Hope this helps.

Answered By - Fares