How to pass kwargs into Python function using PythonKit (Swift)

Question

I am trying to pass keyword arguments into a Python function using PythonKit. So far, I have just passed strings, but this is stumping me. I do not know how PythonKit processes these dictionary inputs. I have put what I have tried so far (nonworking) and what my Python function expects. Thank you in advance!

    private func createDBDirectory() {
        let DBDirectoryPath = createDirectory(folderName: "databases")!.path
        userConfig.DBPath = DBDirectoryPath + "/fileORGS.db"
        let sqlInteract = Python.import("sqlFunctions")
        let tagInfoCols: [String: PythonObject] = ["tag": "NULL", "tagHashID": "NULL", "tagCreationTime": "NULL", "tagColor": "NULL"]
        sqlInteract.sqlCreateTable.callas(userConfig.DBPath, "tagINFO", tagInfoCols)
    }
}

def sqlCreateTable(databasePath, tableName: str, **columns):

Error message given by this code:

PythonKit/Python.swift:553: Fatal error: Could not access PythonObject member 'callas'

I expect the dictionary or kwargs to be passed into the Python function without raising an exception.

Sweeper · Accepted Answer · 2025-02-26 07:49:32Z

If all the argument names and the number of arguments are known at compile time, you can just do what you'd do in Python, except replacing the = with :,

sqlInteract.sqlCreateTable(
    userConfig.DBPath, "tagINFO",
    tag: "NULL",
    tagHashID: "NULL",
    tagCreationTime: "NULL",
    tagColor: "NULL"
)

If the number of arguments and/or parameter names is dynamic, you should use dynamicallyCall(withKeywordArguments:). Pass in a KeyValuePairs<String, any PythonConvertible>, or an [(String, any PythonConvertible)]. This should contain all the arguments you want to pass.

Use an empty string "" as the key if you don't want to pass an argument label.

// you can add/remove elements to this if you change this to "var"
let arguments: KeyValuePairs<String, any PythonConvertible> = [
    "": userConfig.DBPath,
    "": "tagINFO",
    "tag": "NULL",
    "tagHashID": "NULL",
    "tagCreationTime": "NULL",
    "tagColor": "NULL"
]
sqlInteract.sqlCreateTable.dynamicallyCall(withKeywordArguments: arguments)

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