code: def SegmentCollection(mode="agg-fast", *args, **kwargs):
      
  
      if mode == "raw":
          return RawSegmentCollection(*args, **kwargs)
      return AggSegmentCollection(*args, **kwargs)
docs: mode: string
        - "raw" (speed: fastest, size: small, output: ugly, no dash,
                 no thickness)
        - "agg" (speed: slower, size: medium, output: perfect, no dash)