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<!DOCTYPE html>
<htmllang="en">
<head>
<metacharset="UTF-8" />
<metaname="viewport" content="width=device-width, initial-scale=1.0" />
<linkrel="shortcut icon" href="../images/dsa-logo.png" type="image/x-icon" />
<linkrel="stylesheet" href="../style.css" />
<linkrel="stylesheet" href="style.css">
<title>Learn DSA Using Python || Code Explorer</title>
</head>
<bodyclass="body">
<marqueeclass="marquee">Learn DSA Using Python || Lesson 02 - Python Revision || Code
Explorer</marquee>
<divclass="main-body">
<divclass="left">
<divclass="logo">
<imgsrc="../images/code.png" alt="" height="100px" width="100px" class="logo-img" />
<divclass="logo-div marquee">
<spanclass="code">Code</span><spanclass="explorer">Explorer</span>
</div>
<spanclass="dropdown"></span>
</div>
<hrclass="one" />
<divclass="hide-on-small-screen">
<spanclass="contents">Contents</span>
<hrclass="two nav-two" />
<ultype="none" class="nav-hidden">
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="../index.html">
<spanclass="lesson">Lesson 1 / Intro</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="index.html">
<spanclass="lesson">Lesson 2 / Python Revision</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="../lesson-03/index.html">
<spanclass="lesson">Lesson 3 / Data Structures</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="../lesson-04/index.html">
<spanclass="lesson">Lesson 4 / Algorithms</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 1 / Intro</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 2 / Revision</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 3 / Testing</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 4 / Output</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 1 / Intro</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 2 / Revision</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 3 / Testing</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 4 / Output</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 1 / Intro</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 2 / Revision</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 3 / Testing</span>
</a>
</li>
<hrclass="two" />
<li>
<imgsrc="../images/arrow.png" alt="" class="arrow-img" />
<ahref="https://youtube.com">
<spanclass="lesson">Lesson 4 / Output</span>
</a>
</li>
<hrclass="two" />
</ul>
</div>
</div>
<divclass="right">
<h1class="h1">
Welcome To DSA Complete Course Using Python By Code Explorer
</h1>
<hrclass="one" />
<h1class="h1">This Is A Quick Revision Of Python For This Course</h1>
<divclass="video-container">
<iframewidth="560" height="315" src="https://www.youtube.com/embed/EaUnN9SZmy8" title="YouTube video player"
frameborder="0"
allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
allowfullscreen></iframe>
</div>
<center>
<divid="box">
<astyle="color: chartreuse;" href="https://www.youtube.com/watch?v=RQKJB7z-OqU&list=PLGxMeslbGNsU38f0599lOC-cRmrf01lD3&pp=iAQB"><span>Full
PlayList</span></a>
</div>
</center>
<hrclass="one" />
<pclass="p" style="color: aqua !important">
Python is a versatile programming language known for its simplicity
and readability, making it an excellent choice for both beginners and
experienced programmers. It provides an extensive set of libraries and
frameworks that make development faster and more efficient. Moreover,
Python's popularity has grown immensely over the years, making it one
of the most widely used programming languages.
</p>
<pclass="p" style="color: aqua !important">
When it comes to Data Structures and Algorithms (DSA), Python offers a
range of built-in data structures and comprehensive libraries that
simplify the implementation of algorithms. These features, combined
with Python's expressive syntax, make it an ideal language for working
with DSA.
</p>
<pclass="p" style="color: aqua !important">
Let's explore some of the key aspects of Python programming and its relevance to DSA :-
</p>
<pclass="p" style="color: aqua !important">
<olstyle="padding-left: 50px; padding-right: 20px;">
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Readability and
Simplicity:</span> Python emphasizes code readability, utilizing an elegant and intuitive syntax.
This makes it easier to understand and maintain code, especially when dealing with complex data structures and
algorithms. Python's minimalist design philosophy encourages developers to write clean and concise code,
reducing the likelihood of errors and making it easier to reason about DSA implementations.
</li>
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Data Structures:</span>
Python provides a variety of built-in data
structures, such as lists, tuples, dictionaries,
sets, and more. These data structures are versatile and efficient, allowing you to store and manipulate data
effectively. They serve as the foundation for implementing various algorithms and solving problems
efficiently.
</li>
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Standard Library and
Third-Party Modules:</span> Python's standard
library includes numerous modules that offer a wide range of functionalities. Many of these modules are
relevant to DSA, providing implementations of common algorithms and data structures. For example, the
"collections" module offers advanced data structures like deque and OrderedDict. Additionally, there are
several popular third-party libraries, such as NumPy, Pandas, and SciPy, which provide powerful tools for
numerical computing, data manipulation, and scientific computing.
</li>
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Algorithmic
Implementations:</span> Python's flexibility allows for
easy implementation of algorithms. It supports imperative, functional, and object-oriented programming
paradigms, providing developers with various approaches to solving algorithmic problems. Additionally,
Python's dynamic typing and high-level abstractions allow for rapid prototyping and experimentation, enabling
programmers to iterate quickly on algorithmic solutions.
</li>
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Pythonic Idioms:</span>
Pythonic idioms refer to programming
practices and patterns specific to Python. These idioms emphasize code clarity and readability while
leveraging the language's unique features. By following Pythonic idioms, DSA implementations become more
elegant and concise. For instance, list comprehensions, generators, and context managers are common Pythonic
constructs that can simplify code related to algorithms and data structures.
</li>
<listyle="display: block !important; color: aqua; padding-bottom: 10px;"><span
style="color: chartreuse !important; font-style: italic; font-family: cursive;">Testing and
Debugging:</span> Python offers robust testing
frameworks, such as unittest and pytest, which aid in the development and verification of DSA implementations.
These frameworks allow you to write test cases, automate test execution, and easily identify and fix issues.
Python's debugging capabilities, with tools like pdb (Python Debugger), help diagnose and resolve problems
efficiently.
</li>
</ol>
</p>
<pclass="p" style="color: aqua !important">
Overall, Python's combination of simplicity, readability, powerful libraries, and vast community support makes
it an excellent choice for implementing data structures and algorithms. Its ecosystem provides ample resources,
tutorials, and documentation to support learning and mastering DSA using Python.
</p>
<hrclass="one" />
<h1class="story">First Python Program</h1>
<hrclass="two" />
<divclass="container main-body-2">
<preclass="left-2">
<codeid="code-block" class="python">
print("Hello, World!")
</code>
</pre>
<buttonclass="copy-button right-2" onclick="copyCode()">Copy Code</button>
</div>
<divid="notification" class="notification"></div>
<hrclass="one" />
<h1class="h1">
Variables In Python
</h1>
<hrclass="two" />
<pclass="p" style="color: aqua !important">Variables are the name , given to a particular memory location. We've
to follow some rule to declare a variable names in Python . Those are :-</p>
<h1class="story">Do This</h1>
<spanclass="do" style="color: chartreuse; font-family: cursive; font-size: 20px; padding-left: 100px;">1) Starts
with only A-Z / a-z/ _ .</span>
<br/>
<spanclass="do" style="color: chartreuse; font-family: cursive; font-size: 20px; padding-left: 100px;">2) Can
contain number in the middle.</span>
<h1class="story">Don't Do This</h1>
<spanclass="do" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1) Doesn't
starts with any number (0-9).</span>
<br/>
<spanclass="do" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">2) Some
system variables starts with (_) , so we'll avoid that.</span>
<pclass="p">As Python is a Dynamically Typed programming language , we don't need to mention the data type of the
variable . This will automatically detect that .</p>
<hrclass="one" />
<h1class="h1">
Data Types In Python
</h1>
<hrclass="two" />
<pclass="p">We've some by default data-types in Python like,-</p>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
Integer</span>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">2)
Float</span>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">3)
Strings</span>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">4)
Arrays</span>
<pclass="p">To know a data-type of a variable , we can use <spanstyle="color: greenyellow;">type()</span>
function .</p>
<hrclass="one" />
<h1class="h1">Arithmetical Operators</h1>
<hrclass="two" />
<pclass="p">In Python we've some Arithmetical Operators ,-</p>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[+]</b>
To add two integers / floats / strings</span>
<br/>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[-]</b>
To subtract two integers / floats</span>
<br/>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[*]</b>
To multiply two integers / floats</span>
<br/>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[/]</b>
To divide two integers / floats</span>
<br/>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[**]</b>
To power two integers / floats</span>
<br/>
<spanclass="dos" style="color: #ff002b; font-family: cursive; font-size: 20px; padding-left: 100px;">1)
<bstyle="color: chartreuse;">[//]</b>
To floor division two integers / floats</span>
<hrclass="one" />
<h1class="h1">Taking Inputs</h1>
<hrclass="two" />
<pclass="p">We've to use <spanstyle="color: chartreuse;">input()</span> function to take inputs , from the users
. By default the <spanstyle="color: chartreuse;">input()</span> function stores the user input in string
data-type format .</p>
<divclass="container main-body-2">
<preclass="left-2">
<codeid="code-block" class="python">
def add():
input1 = input("Enter Your first Number : ")
input2 = input("Enter Your second Number : ")
output = input1 + input2
print("The result is " + output)
add()
</code>
</pre>
</div>
<hrclass="two" />
<pclass="p">This code will store your numbers as string data-type , so it will not add your numbers . But if you
want to add them , you've to convert the data-type to string(str) to integer(int) . Let see how we can do that,-
</p>
<divclass="container main-body-2">
<preclass="left-2">
<codeid="code-block" class="python">
def add():
input1 = int(input("Enter Your first Number : "))
input2 = int(input("Enter Your second Number : "))
output = input1 + input2
print("The result is " + output)
add()
</code>
</pre>
</div>
<center>
<divid="box">
<astyle="color: chartreuse;" href="../lesson-2/quiz.html"><span>Take Quiz</span></a>
</div>
</center>
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