code: def get_version_number(zipped_pex=False):
    
    if zipped_pex:
      release_file = get_zipped_heron_release_file()
    else:
      release_file = get_heron_release_file()
    with open(release_file) as release_info:
      for line in release_info:
        trunks = line[:-1].split(' ')
        if trunks[0] == 'heron.build.version':
          return trunks[-1].replace("'", "")
      return 'unknown'
docs: Print version from release.yaml
  
    :param zipped_pex: True if the PEX file is built with flag `zip_safe=False'.