\nIntegrating Python functions into JavaScript enriches web applications with Python’s robust capabilities. Methods like WebAssembly and Node.js ‘child_process’ module facilitate this integration. WebAssembly involves creating a module from Python code, while ‘child_process’ executes Python scripts within JavaScript, both methods enabling seamless use of Python functionalities in a JavaScript environment<\/em><\/p>\n<\/blockquote>\n\n\n\n
There are some methods to call a Python function from JavaScript. The first method is we need to use a technology called “WebAssembly”. WebAssembly is used to run in web browsers. Another method is using the Node.js Child Process Module.<\/p>\n\n\n\n
WebAssembly for Python – JavaScript Integration<\/h3>\n\n\n\n
To call a Python function from JavaScript using WebAssembly<\/strong> you need to follow some steps: <\/p>\n\n\n\n
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- Write a Python function that you want to call from JavaScript. For example, a Python function that adds two numbers with a file named add.py:<\/li>\n<\/ul>\n\n\n
\ndef add(a, b):\n return a + b\n<\/pre><\/div>\n\n\nThis is a simple function of the addition of two numbers. The output of this function will be the addition.<\/p>\n\n\n\n
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- Compile a Python function to WebAssembly using a tool Emscripten. Emscripten is a compiler that can compile Python code using the library called PythonJs. To compile, first you need to install Emscipten. Once you have installed Emscripten, you can compile the Python function to WebAssembly using the following command:<\/li>\n<\/ul>\n\n\n
\npythonjs -O3 -j add.py -o add.js\n<\/pre><\/div>\n\n\nThis will compile the Python function to JavaScript and WebAssembly code and save it with a file add.js.<\/p>\n\n\n\n
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- Now call the Python function from the JavaScript using the WebAssembly module. To call a function in a WebAssembly module, you need to use the module.exports<\/strong> object. This object contains all the functions and variables defined in the WebAssembly module. Here is an example of how to call add()<\/strong> function:<\/li>\n<\/ul>\n\n\n
\nfetch('add.js')\n .then(response => response.arrayBuffer())\n .then(buffer => WebAssembly.instantiate(buffer))\n .then(module => {\n const add = module.exports.add;\n const result = add (1, 2);\n console.log(result);\n });\n<\/pre><\/div>\n\n\nIn this example, we first load add.js<\/strong> module using function fetch().<\/strong> Then we use the WebAssembly.instantiate()<\/strong> function to create WebAssembly module. Now we can access the add() function using module.exports<\/strong> object. Then finally we call the add()<\/strong> function with the arguments 1 and 2 and store the result in the variable called the result<\/strong>. <\/p>\n\n\n\n
![\"JSCode\"](\"https:\/\/www.askpython.com\/wp-content\/uploads\/2023\/12\/JSCode-1024x146.png\")
<\/figure>\n\n\n\n![\"Example](\"https:\/\/www.askpython.com\/wp-content\/uploads\/2023\/12\/Example_output-1024x223.png\")
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