code: def _load_cytoBand(filename):
          
          try:
              # adapted from chromosome plotting code (see [1]_)
              df = pd.read_table(
                  filename, names=["chrom", "start", "end", "name", "gie_stain"]
              )
              df["chrom"] = df["chrom"].str[3:]
              return df
          except Exception as err:
              print(err)
              return None
docs: Load UCSC cytoBand table.
  
          Parameters
          ----------
          filename : str
              path to cytoBand file
  
          Returns
          -------
          df : pandas.DataFrame
              cytoBand table if loading was successful, else None
  
          References
          ----------
          ..[1] Ryan Dale, GitHub Gist,
            https://gist.github.com/daler/c98fc410282d7570efc3#file-ideograms-py