code: def prepend_bcbiopath():
      
      if os.environ.get('BCBIOPATH'):
          os.environ['PATH'] = _prepend(os.environ.get('PATH', ''),
                                        os.environ.get('BCBIOPATH', None))
      else:
          os.environ['PATH'] = _prepend(os.environ.get('PATH', ''),
                                        utils.get_bcbio_bin())
docs: Prepend paths in the BCBIOPATH environment variable (if any) to PATH.
  
      Uses either a pre-sent global environmental variable (BCBIOPATH) or the
      local anaconda directory.