What is the difference between Python and JavaScript?

JavaScript makes web pages interactive. JavaScript, along with HTML and CSS, improves web page functionality. JavaScript validates forms, makes interactive maps, and displays dynamic charts. When the web page is loaded, the JavaScript engine in the web browser runs the JavaScript code, which is after the HTML and CSS have been downloaded. The JavaScript code then changes the HTML and CSS to update the user interface in real time.

JavaScript code is run by a program called a JavaScript engine. Originally, JavaScript engines were built as interpreters. However, modern JavaScript engines are often just-in-time compilers that convert JavaScript code into bytecode to run faster.

Python is a general-purpose high-level programming language. Python is used for web development, machine learning, and other cutting-edge software. Python is suitable for both novice and experienced C and Java programmers. Guido Van Rossam created Python in 1989 at the Netherlands National Institute. Python was released in 1991. Beginners should learn Python.

Read this article to learn about Python and JavaScript and the differences between these two programming languages.

What is Python?

Python is an object-oriented, dynamic, interpreted language. Advanced data structures, dynamic typing, and binding make it a powerful choice for rapid application development.

• Python’s syntax is simple and clear. It focuses on simplicity and reduces program maintenance costs.

• Python modules and packages help divide projects and reuse code.

• The Python interpreter and extensive standard library are available for free download on all major platforms. They are also free.

• Python programmers can easily resolve errors because defects or incorrect input do not cause segmentation faults. If an error occurs, the interpreter throws an exception. Unhandled exceptions cause the interpreter to print a stack trace.

• The source-level debugger allows you to view local and global variables, evaluate expressions, set breakpoints, and more. Python's debugger shows its own excellence. Adding print statements to your source code is the fastest way to detect errors. This quick cycle of editing, testing, and fixing works really well.

Using Python, we can do the following:

• Web development

• Data analysis and Machine learning

• Automation and scripting

• Software testing and more

Features of Python

Here are some important features of Python:

• Easy to learn - Python has a simple structure, few keywords and clear syntax. Code written in Python is easier to read and understand.

• Easy to maintain - Python source code is quite easy to maintain.

• Large standard library - Most of Python's libraries are easy to port and can run on UNIX, Windows, and Mac.

• Portability - Python can run on a variety of hardware platforms, all with the same interface

Python Example

Please see the following example Python code-

a = int(input("Enter value for a : "))
b = int(input("Enter value for b : "))
s = a+b

print("The number you have entered for a is ", a)
print("The number you have entered for b is ", b)
print("The sum of {} and {} is {}".format(a,b,s))

In our example, we have used two variables "a" and "b" and assigned some value. Please note that in Python, we do not need to explicitly declare the data type of the variable because PVM automatically assigns the data type based on user input.

• input( )Function accepts keyboard input. In Python, the return type of input() is a string, so we have to convert it explicitly. In our example, we did the conversion using int( ).

• print( ) is used to display output.

• .format() is a function used to format Python output.

Output

Executing this sample Python code will produce the following Output -

Enter value for a : 10
Enter value for b : 20
The number you have entered for a is 10
The number you have entered for b is 20
The sum of 10 and 20 is 30.

What is JavaScript?

JavaScript is used to develop websites, web applications, games, and more. It can add dynamic content to web pages that HTML and CSS cannot achieve. Many browsers use JavaScript to modify website content.

JavaScript can create clickable drop-down menus, supplement page content, and dynamically change page colors.

No JavaScript, only HTML and CSS are available for web pages. HTML explains the structure and content of web documents. CSS formats the content of the website. HTML and CSS are called markup languages ​​rather than programming languages ​​because they mark up static content. JavaScript is a dynamic programming language that allows you to perform operations such as calculating mathematics, adding HTML content to the DOM, fetching content from other websites, and more.

JavaScript Examples

JavaScript can be embedded in HTML in a variety of ways.

JavaScript in

Let’s look at an example that demonstrates how to write JS-based code in HTML tags and use some attributes.

<body>
   <script type="text/javascript">
      document.write("JavaScript inside <body>&hellip;&hellip;&hellip;</body> tag");
   </script>
</body>

document.write()The function is used to display content that changes over time.

Output

The above code will produce the following Output −

JavaScript inside <body>&hellip;&hellip;&hellip;</body> tag

JavaScript in

如果你想让一个脚本在某些事件发生时运行，比如当用户点击某个地方，你可以像这样把脚本放在head中 −

示例

<html>
<head>
   <script type = "text/javascript">
      function msg () {
         alert("Javascript Inside <head> tag")
      }
   </script>
</head>

<body>
   <p> Click the Below button </p>
   <input type = "button" onclick = "msg()" value = "alert!" />
</body>
</html>

在上面的示例中，我们正在创建一个名为“alert！”的按钮，它位于body标签内部，并带有一些文本。当您点击“alert”按钮时，将调用函数msg()。该函数是一个JavaScript函数，在

部分的<script>标签中声明。<h3>输出<p>上述代码将产生以下<strong>输出−<p><img src="https://img.php.cn/upload/article/000/000/164/169304767662163.jpg" alt="What is the difference between Python and JavaScript?" /><p>单击“alert”按钮时，将显示<head>标签中的JavaScript消息。<h3>外部JavaScript<p>单独的文件可以包含JavaScript代码。要使用来自外部文件源的JavaScript，请将“.js”文件与HTML文件一起包含。让我们举一个例子来看看它是如何工作的。<p>我们正在创建一个名为“display.js”的外部JavaScript文件，它将在警告对话框中显示一些消息。<p><strong>display.js<pre class='brush:php;toolbar:false;'>function display () { alert(&quot;External javascript file display.js&quot;) }</pre><p>现在将此JavaScript文件包含到HTML页面中。它将在按钮点击时调用<strong>display()函数。<p><strong>Index.html<pre class='brush:javascript;toolbar:false;'>&lt;html&gt; &lt;head&gt; &lt;script type = &quot;text/javascript&quot; src=&quot;display.js&quot;&gt;&lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;p&gt; Click The Below button &lt;/p&gt; &lt;input type = &quot;button&quot; onclick = &quot;display()&quot; value = &quot;alert!&quot; /&gt; &lt;/body&gt; &lt;/html&gt;</pre><h2>Difference between Python and JavaScript<p>The following table highlights the major differences between Python and JavaScript −<table class="table table-bordered"><thead><tr><th>Basis of Comparison<th>Python<th>JavaScript<tbody><tr><td style="vertical-align: middle;">Procedural Programming<td>Python has many parts of a procedural programming language.<td>JavaScript does not have procedural programming.<tr><td style="vertical-align: middle;">REPL (ReadEval-PrintLoop)<td>When you install Python on your system, you have access to REPL.<td>JavaScript lacks a REPL. Most JS code is browser-based. Node.js includes JavaScript.system&#39;s REPL<tr><td style="vertical-align: middle;">Mutability<td>Python has the datatypes which are mutable and immutable like string is mutable and list is immutable.<td>There is no concept of mutable and immutable in JavaScript<tr><td style="vertical-align: middle;">Numeric types<td>Python has many different numeric types like <strong>int, float, long etc.<td>JavaScript has only numbers which are only floating point types.<tr><td style="vertical-align: middle;">Inheritance<td>Python has class-based inheritance model.<td>JavaScript has prototype-based inheritance.<tr><td style="vertical-align: middle;">Performance<td>Software that runs on Python will take longer to work, making it less useful for the user community.<td>JavaScript, on other hand, is more useful when analyzing the performance.<h2>Conclusion<p>Python vs. JavaScript is a close call. Python is superior to other programming languages due to its simplicity of use in AI and ML. At the same time, most developers are comfortable with JavaScript, and hence it is used more often.</script>

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