    title="contains(t: Transaction; key: string): bool">contains(t: Transaction; key: string): bool</a></li>

  </ul>
  <ul class="simple nested-toc-section">del
      <li><a class="reference" href="#del.t%2CTransaction%2Cstring"
    title="del(t: Transaction; key: string)">del(t: Transaction; key: string)</a></li>

  </ul>
  <ul class="simple nested-toc-section">len
      <li><a class="reference" href="#len.t%2CTransaction"
    title="len(t: Transaction): int">len(t: Transaction): int</a></li>

  </ul>
  <