What is the difference between Python and JavaScript?-Python Tutorial-php.cn

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))

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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.

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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>

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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

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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>

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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