docs: def get_cytoband_maps(names=[]):
      """Load all cytoband maps
  
      >>> maps = get_cytoband_maps()
      >>> maps["ucsc-hg38"]["1"]["p32.2"]
      [55600000, 58500000, 'gpos50']
      >>> maps["ucsc-hg19"]["1"]["p32.2"]
      [56100000, 59000000, 'gpos50']
      """
      if names == []:
          names = get_cytoband_names()
      return {name: get_cytoband_map(name) for name in names}