The ultimate guide to senior engineering interviews. Strategies developed by FAANG engineers on Python concurrency, multithreading, monitors, and event loops. Prep faster for top company questions.

Concurrency in Python is one of the most complex and advanced topics brought up during senior engineering interviews. Knowledge of concurrency and multithreading can put interviewees at a considerable advantage. This course lays the foundations of advanced concurrency and multithreading and explains concepts such as Monitors, Event Loops and Deferred Callbacks in depth. It also builds simple and complete solutions to popular concurrency problems that can be asked about in interviews like the Reader-Writer Problem and the Dining Philosopher Problem. While prior knowledge of concurrency is not required to follow through with this course, familiarity with the very basic Python would be helpful.

Python Concurrency for Senior Engineering Interviews

<div class="card">
   # Subclassing Thread   
   <div class="ans">
<p>Another way to create threads is to subclass the <code class="clazz">Thread</code> class. As mentioned earlier, the <code class="mthd">threading</code> module is inspired from Java and Java offers a similar way  of creating threads by subclassing. Consider the snippet below:</p>
## Creating threads by subclassing Thread class
<b>

```python
class MyTask(Thread):

    def __init__(self):
        Thread.__init__(self, name="subclassThread", args=(2, 3))

    def run(self):
        print("{0} is executing".format(current_thread().getName()))

```
</b>

<p>The important caveats to remember when subclassing the <code class="clazz">Thread</code> class are:</p>
<ul>
<li><p>We can only override the <code class="mthd">run()</code> method and the constructor of the <code class="clazz">Thread</code> class.</p></li>
<li><p><code class="mthd">Thread.__init__()</code> must be invoked if the subclass choses to override the constructor.</p></li>
<li><p>Note that the <code class="mthd">args</code> or <code class="mthd">kwargs</code> don't get passed to the <code class="mthd">run</code> method.</p></li>
</ul>


</div>
</div>


<div>
   # Subclassing Thread   
   <div>
<p>Another way to create threads is to subclass the <code>Thread</code> class. As mentioned earlier, the <code>threading</code> module is inspired from Java and Java offers a similar way  of creating threads by subclassing. Consider the snippet below:</p>
## Creating threads by subclassing Thread class
<b>

```python
class MyTask(Thread):

    def __init__(self):
        Thread.__init__(self, name="subclassThread", args=(2, 3))

    def run(self):
        print("{0} is executing".format(current_thread().getName()))

```
</b>

<p>The important caveats to remember when subclassing the <code>Thread</code> class are:</p>
<ul>
<li><p>We can only override the <code>run()</code> method and the constructor of the <code>Thread</code> class.</p></li>
<li><p><code>Thread.__init__()</code> must be invoked if the subclass choses to override the constructor.</p></li>
<li><p>Note that the <code>args</code> or <code>kwargs</code> don't get passed to the <code>run</code> method.</p></li>
</ul>


</div>
</div>


This lesson demonstrates how we can subclass the Thread class to create threads.

The Basics

Threading Module

Multiprocessing

Concurrent Package

Async.io

Global Interpreter Lock

Interview Practise Problems

The End

Subclassing Thread