如何使用Python azure.kusto.data库为Kusto查询传入动态数组类型参数？

Yes, you absolutely can pass dynamic arrays as parameters to your Kusto queries using the Python azure.kusto.data library—no need for the split-string workaround you're currently considering. The issue you're hitting is just about how you format the parameter value in Python.

Here's the Correct Approach: #

Kusto's dynamic type expects a JSON-serialized string representation of your array (or other dynamic structure). Instead of passing a native Python list directly, you need to convert it to a JSON string first using json.dumps().

Step 1: Format Your Parameters Correctly

import json
from azure.kusto.data import KustoClient, KustoConnectionStringBuilder

# Your connection setup (adjust cluster details as needed)
cluster = "https://<your-cluster>.kusto.windows.net"
client = KustoClient(KustoConnectionStringBuilder.with_aad_device_authentication(cluster))

# Convert the list to a JSON string for the dynamic parameter
params = {
    "scenario": "string",
    "env": "string2",
    "duration": "string3",
    "value_list": json.dumps([1, 2, 3, 4])
}

Step 2: Update Your Kusto Query

Keep the declare query_parameters section as you had it, but make sure to wrap the value_list parameter in parentheses when using it with in (this is required for array comparison in Kusto):

declare query_parameters(scenario:string, env:string, duration:string, value_list:dynamic);
Some_Kusto_Query(scenario, env, duration)
| where value in (value_list)

Step 3: Execute the Query

Pass the query and parameters to the client as you normally would:

database = "<your-database-name>"
result = client.execute(database, query, params=params)

Why This Works: #

The azure.kusto.data library maps Python values to Kusto types under the hood, but for dynamic types, it relies on the parameter being a valid JSON string that Kusto can parse into its native dynamic format. Directly passing a Python list doesn't work because the library doesn't automatically serialize it—you have to handle that step explicitly.

Bonus: Handling Complex Dynamic Structures #

This approach works for more than just simple arrays. If you need to pass a list of objects or other nested dynamic data, just serialize that with json.dumps() too:

# Example: Passing an array of objects
complex_list = [{"id": 1, "name": "foo"}, {"id": 2, "name": "bar"}]
params["complex_dynamic"] = json.dumps(complex_list)

Then in your Kusto query, you can use it like any other dynamic value:

declare query_parameters(complex_dynamic:dynamic);
print complex_dynamic
| mv-expand complex_dynamic
| extend Id = complex_dynamic.id, Name = complex_dynamic.name

Avoiding Common Pitfalls #

• Don't forget the parentheses around value_list in the where ... in clause—Kusto requires this when comparing against a dynamic array.
• Ensure your JSON string is properly formatted (no trailing commas, valid syntax) to avoid parsing errors in Kusto.

内容的提问来源于stack exchange，提问作者superli3