code: def sparklines(
      self, series: List[Union[int, float]]
  ) -> Optional[str]:
      # Only print sparklines if the terminal is utf-8
      if wandb.util.is_unicode_safe(sys.stdout):
          return sparkline.sparkify(series)
      return None
  
imports: import itertools
  import platform
  import sys
  from abc import abstractmethod
  from typing import Callable, List, Optional, Tuple, Union
  import click
  import wandb
  from .None import ipython, sparkline
label_desc: Use image node_id 1 for calling the _Printer obj's underlying member method code with example usage: obj.sparklines(series) and returns: None, sparkline