code: def check_polars_installed():
      try:
          global pl
          import polars as pl
      except ImportError:
          raise ImportError(
              "polars not installed. Install with `pip install polars` or set "
              "`DataContext.use_polars = False` to fall back to pyarrow"
          )
  
label_desc: Use image node_id 1 for calling a global function with example usage: check_polars_installed() without return types