The latest articles on DEV Community by tortellini (@tortellini). https://dev.to/tortellini https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F280449%2Fff0fa667-9fe7-4d16-8aa2-0eec47aae26d.png https://dev.to/tortellini en tortellini Thu, 16 Apr 2020 18:52:54 +0000 https://dev.to/tortellini/unconventional-hobbies-during-quarantine-3mo4 https://dev.to/tortellini/unconventional-hobbies-during-quarantine-3mo4 <h1> With the world on lockdown: </h1> <ul> <li>Comment something (<strong><em>unconventional</em></strong>) worth learning/exploring/killing-time <strong>(non-dev related)</strong>: <ul> <li>Origami</li> <li>Card stacking</li> <li>Type racing</li> <li>...</li> </ul> </li> </ul> <h6> Note: </h6> <ul> <li>I will try to keep this list as up-to date as possible with comments below 👍</li> </ul> hobbies fun quarantine tortellini Fri, 20 Mar 2020 02:59:14 +0000 https://dev.to/tortellini/careful-when-using-python-generators-2a0p https://dev.to/tortellini/careful-when-using-python-generators-2a0p <h1> Yes, they are memory efficient! </h1> <ul> <li>Python generators may prove themselves extremely useful in cases when you have large amounts of data and are trying to feed it to an iterator. In short, generators return a lazy iterator that does not store their contents in memory. WOW! Great, sounds like you save yourself the trouble of running into a <code>MemoryError</code>, right?</li> </ul> <h1> But, they hide something... </h1> <div class="highlight"><pre class="highlight python"><code><span class="n">nums</span> <span class="o">=</span> <span class="p">(</span><span class="n">x</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">10000000000000</span><span class="p">))</span> <span class="k">for</span> <span class="n">num</span> <span class="ow">in</span> <span class="n">nums</span><span class="p">:</span> <span class="k">print</span><span class="p">(</span><span class="n">num</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s">" "</span><span class="p">)</span> <span class="o">&gt;&gt;&gt;</span> <span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">,</span><span class="mf">4.</span><span class="p">...</span> <span class="k">for</span> <span class="n">num</span> <span class="ow">in</span> <span class="n">nums</span><span class="p">:</span> <span class="k">print</span><span class="p">(</span><span class="n">num</span><span class="o">*</span><span class="mi">2</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s">" "</span><span class="p">)</span> <span class="c1"># What do you think is the output of the above for loop? </span></code></pre></div> <h1> Generators are hungry hungry! </h1> <ul> <li>When iterating over a generator, the elements at each location are essentially being "consumed" and "discarded".</li> <li>In other words, if you try to iterate AGAIN over the generator, it will look like all of your elements vanished!</li> </ul> <h1> Answer to the code above: </h1> <ul> <li><strong>You will see no numbers printed to the console.</strong></li> </ul> <h2> Leave your comments below! </h2> python generators trick