from cognite.client.data_classes.data_modeling import SpaceApply
spaces = [SpaceApply(space="mySpace", description="My first space", name="My Space"),
SpaceApply(space="myOtherSpace", description="My second space", name="My Other Space")]
res = client.data_modeling.spaces.apply(spaces)

{
  "items": [
    {
      "space": "<string>",
      "createdTime": 1730204346000,
      "lastUpdatedTime": 1730204346000,
      "isGlobal": true,
      "description": "<string>",
      "name": "<string>"
    }
  ]
}