 class="t"><span class="key">import</span> <span class="nam">contextlib</span>&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t4" href="#t4">4</a></span><span class="t"><span class="key">import</span> <span class="nam">functools</span>&nbsp;</span><span class="r"></span></p>
    <p class="run"><span class="n"><a id="t5" href="#t5">5</a></span><span class="t"><span class="key">import</span> <span class="nam">hashlib</span>&nbsp;</span><span class="r"></span></p>
    <p clas