function = client.functions.create(
    name="myfunction",
    folder="path/to/code",
    function_path="path/to/function.py")

function = client.functions.create(
    name="myfunction", file_id=123, function_path="path/to/function.py")

function = client.functions.create(name="myfunction", function_handle=handle)

def handle(client, data):
    """
    [requirements]
    numpy
    [/requirements]
    """
    pass
function = client.functions.create(name="myfunction", function_handle=handle)

{
  "items": [
    {
      "id": 4503599627370496,
      "createdTime": 123455234,
      "status": "Queued",
      "name": "myfunction",
      "fileId": 4503599627370496,
      "externalId": "my.known.id",
      "owner": "user@cognite.com",
      "description": "My fantastic function with advanced ML",
      "metadata": {},
      "secrets": {
        "MySecret": "***"
      },
      "functionPath": "myfunction/handler.py",
      "envVars": {
        "MyKey": "MyValue"
      },
      "cpu": 1,
      "memory": 1.5,
      "runtime": "py313",
      "runtimeVersion": "Python 3.11.10",
      "error": {
        "message": "Function deployment failed.",
        "trace": "ERROR: Could not find a version that satisfies the requirement pandas==99.0.0\nERROR: No matching distribution found for pandas==99.0.0"
      },
      "lastCalled": 1730204346000
    }
  ]
}