an><span class="n">add_argument</span><span class="p">(</span><span class="s1">&#39;filename1&#39;</span><span class="p">,</span> <span class="n">metavar</span><span class="o">=</span><span class="s1">&#39;filename1&#39;</span><span class="p">,</span> <span class="nb">type</span><span class="o">=</span><span class="nb">str</span><span class="p">,</span> <span class="n">nargs</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span>
                        <span class="n">help</span><sp