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</div>
<div id="footer">
<h1>PDB - Life Saver</h1>
</div>
</div>
<div class="presentation">
<div class="slide" id="slide0">
<h1 class="title">PDB - Life Saver</h1>
<dl class="docutils">
<dt>Debugging is twice as hard as writing the code in the first place</dt>
<dd><ul class="first last simple">
<li>Brian Wilson Kernighan</li>
</ul>
</dd>
</dl>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">name:</th><td class="field-body">Praveen Kumar (&#64;kumar_pravin)</td>
</tr>
<tr class="field"><th class="field-name">contact:</th><td class="field-body">kumarpraveen [AT] fedoraproject DOT org</td>
</tr>
<tr class="field"><th class="field-name">date:</th><td class="field-body">2015-10-17</td>
</tr>
</tbody>
</table>
</div>
<div class="slide" id="agenda">
<h1>Agenda</h1>
<ul class="simple">
<li>What is debugger</li>
<li>Why pdb is good fit for developer</li>
<li>Demo</li>
</ul>
</div>
<div class="slide" id="debugger">
<h1>Debugger</h1>
<p>Debugging is the process of finding and resolving bugs or defects that prevent
correct operation of computer software or a system.</p>
<ul class="simple">
<li>Source: <a class="reference external" href="https://en.wikipedia.org/wiki/Debugging">https://en.wikipedia.org/wiki/Debugging</a></li>
</ul>
</div>
<div class="slide" id="why-pdb">
<h1>Why pdb?</h1>
<ul class="simple">
<li>So you can debug your python code without hit and trial method.</li>
<li>No need to put lots of print statement to check the flow.</li>
<li>Change the variable value during run and check what would be result.</li>
</ul>
<p>... and lot more.</p>
</div>
<div class="slide" id="newbie-way-of-debugging-code">
<h1>Newbie way of debugging Code</h1>
<pre class="code python literal-block">
<span class="keyword">def</span> <span class="name function">sum_of_squares</span><span class="punctuation">(</span><span class="name">a</span><span class="punctuation">,</span> <span class="name">b</span><span class="punctuation">):</span>
<span class="name">a_squared</span> <span class="operator">=</span> <span class="name">a</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="name">b_squared</span> <span class="operator">=</span> <span class="name">b</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="keyword">print</span> <span class="name">a</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="keyword">print</span> <span class="name">b</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="name">c_squared</span> <span class="operator">=</span> <span class="name">a</span><span class="operator">^</span><span class="literal number integer">2</span> <span class="operator">+</span> <span class="name">b</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="keyword">print</span> <span class="name">c_squared</span>
<span class="keyword">return</span> <span class="name">c_squared</span>
<span class="keyword">if</span> <span class="name">__name__</span> <span class="operator">==</span> <span class="literal string">&quot;__main__&quot;</span><span class="punctuation">:</span>
<span class="keyword">print</span> <span class="name">sum_of_squares</span><span class="punctuation">(</span><span class="literal number integer">3</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>
</pre>
</div>
<div class="slide" id="pdb-way-of-debugging">
<h1>PDB way of debugging</h1>
<pre class="code python literal-block">
<span class="keyword">def</span> <span class="name function">sum_of_squares</span><span class="punctuation">(</span><span class="name">a</span><span class="punctuation">,</span> <span class="name">b</span><span class="punctuation">):</span>
<span class="name">c_squared</span> <span class="operator">=</span> <span class="name">a</span><span class="operator">^</span><span class="literal number integer">2</span> <span class="operator">+</span> <span class="name">b</span><span class="operator">^</span><span class="literal number integer">2</span>
<span class="keyword">return</span> <span class="name">c_squared</span>
<span class="keyword">if</span> <span class="name">__name__</span> <span class="operator">==</span> <span class="literal string">&quot;__main__&quot;</span><span class="punctuation">:</span>
<span class="keyword namespace">import</span> <span class="name namespace">pdb</span><span class="punctuation">;</span> <span class="name">pdb</span><span class="operator">.</span><span class="name">set_trace</span><span class="punctuation">()</span>
<span class="keyword">print</span> <span class="name">sum_of_squares</span><span class="punctuation">(</span><span class="literal number integer">3</span><span class="punctuation">,</span> <span class="literal number integer">4</span><span class="punctuation">)</span>
</pre>
</div>
<div class="slide" id="important-keystroke-to-remember">
<h1>Important keystroke to remember</h1>
<ul class="simple">
<li>h: Print available commands</li>
<li>h &lt;command&gt;: print help about command</li>
<li>q: quit from pdb</li>
<li>p: print value of expr</li>
<li>l: list 11 lines of code around current line</li>
<li>a: print args of current function</li>
</ul>
</div>
<div class="slide" id="continue">
<h1>Continue...</h1>
<ul class="simple">
<li>&lt;Enter&gt; repeat last command</li>
<li>n(ext) execute the current statement (step over)</li>
<li>s(tep) execute and step into function</li>
<li>r(eturn) continue execution until the current function returns</li>
<li>c(ontinue) continue execution until a breakpoint is encountered</li>
<li>u(p) move one level up in the stack trace</li>
<li>d(own) move one level down in the stack trace</li>
</ul>
</div>
<div class="slide" id="useful-links">
<h1>Useful Links</h1>
<ul class="simple">
<li>pdb-cheatsheat: <a class="reference external" href="https://github.com/nblock/pdb-cheatsheet">https://github.com/nblock/pdb-cheatsheet</a></li>
<li>pdb-doc: <a class="reference external" href="https://docs.python.org/3/library/pdb.html">https://docs.python.org/3/library/pdb.html</a></li>
<li>Slide Source: <a class="reference external" href="https://github.com/praveenkumar/meetups">https://github.com/praveenkumar/meetups</a></li>
</ul>
</div>
<div class="slide" id="questions">
<h1>Questions</h1>
<p><strong>?</strong></p>
</div>
<div class="slide" id="thank-you">
<h1>Thank You</h1>
</div>
</div>
</body>
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