How can I run a Python script in HTML?
Question:
Currently I have some Python files which connect to an SQLite database for user inputs and then perform some calculations which set the output of the program. I’m new to Python web programming and I want to know: What is the best method to use Python on the web?
Example: I want to run my Python files when the user clicks a button on the web page. Is it possible?
I started with Django. But it needs some time for the learning. And I also saw something called CGI scripts. Which option should I use?
Answers:
You can’t run Python code directly
You may use Python Inside HTML.
Or for inside PHP this:
http://www.skulpt.org/
It probably would depend on what you want to do. I personally use CGI and it might be simpler if your inputs from the web page are simple, and it takes less time to learn. Here are some resources for it:
However, you may still have to do some configuring to allow it to run the program instead of displaying it.
Here’s a tutorial on that: Apache Tutorial: Dynamic Content with CGI
If your web server is Apache you can use the
mod_python module in order to run your Python CGI scripts.
You are able to run a Python file using HTML using PHP.
Add a PHP file as index.php:
<html>
<head>
<title>Run my Python files</title>
<?PHP
echo shell_exec("python test.py 'parameter1'");
?>
</head>
Passing the parameter to Python
Create a Python file as test.py:
import sys
input=sys.argv[1]
print(input)
Print the parameter passed by PHP.
Thanks to WebAssembly and the Pyodide project, it is now possible to run Python in the browser. Check out this tutorial on it.
Update: Pyodide v0.21.0
(async () => { // create anonymous async function to enable await
var output = document.getElementById("output")
var code = document.getElementById("code")
output.value = 'Initializing...n'
window.pyodide = await loadPyodide({stdout: addToOutput, stderr: addToOutput}) // redirect stdout and stderr to addToOutput
output.value += 'Ready!n'
})()
function addToOutput(s) {
output.value += `${s}n`
output.scrollTop = output.scrollHeight
}
async function evaluatePython() {
addToOutput(`>>>${code.value}`)
await pyodide.loadPackagesFromImports(code.value, addToOutput, addToOutput)
try {
let result = await pyodide.runPythonAsync(code.value)
addToOutput(`${result}`)
}
catch (e) {
addToOutput(`${e}`)
}
code.value = ''
}
<script src="https://cdn.jsdelivr.net/pyodide/v0.21.3/full/pyodide.js"></script>
Output:
<textarea id="output" style="width: 100%;" rows="10" disabled=""></textarea>
<textarea id="code" rows="3">import numpy as np
np.ones((10,))
</textarea>
<button id="run" onclick="evaluatePython()">Run</button>
Old answer (related to Pyodide v0.15.0)
const output = document.getElementById("output")
const code = document.getElementById("code")
function addToOutput(s) {
output.value += `>>>${code.value}n${s}n`
output.scrollTop = output.scrollHeight
code.value = ''
}
output.value = 'Initializing...n'
// Init pyodide
languagePluginLoader.then(() => { output.value += 'Ready!n' })
function evaluatePython() {
pyodide.runPythonAsync(code.value)
.then(output => addToOutput(output))
.catch((err) => { addToOutput(err) })
}
<!DOCTYPE html>
<head>
<script type="text/javascript">
// Default Pyodide files URL ('packages.json', 'pyodide.asm.data', etc.)
window.languagePluginUrl = 'https://cdn.jsdelivr.net/pyodide//v0.15.0/full/';
</script>
<script src="https://cdn.jsdelivr.net/pyodide//v0.15.0/full/pyodide.js"></script>
</head>
<body>
Output:
</div>
<textarea id='output' style='width: 100%;' rows='10' disabled></textarea>
<textarea id='code' rows='3'>
import numpy as np
np.ones((10,))
</textarea>
<button id='run' onclick='evaluatePython()'>Run</button>
<p>You can execute any Python code. Just enter something
in the box above and click the button.
<strong>It can take some time</strong>.</p>
</body>
</html>
There is a way to do it with Flask!
Installation
First you have to type pip install flask.
Setup
You said when a user clicks on a link you want it to execute a Python script
from flask import *
# Importing all the methods, classes, functions from Flask
app = Flask(__name__)
# This is the first page that comes when you
# type localhost:5000... it will have a tag
# that redirects to a page
@app.route("/")
def HomePage():
return "<a href='/runscript'>EXECUTE SCRIPT </a>"
# Once it redirects here (to localhost:5000/runscript),
# it will run the code before the return statement
@app.route("/runscript")
def ScriptPage():
# Type what you want to do when the user clicks on the link.
#
# Once it is done with doing that code... it will
# redirect back to the homepage
return redirect(url_for("HomePage"))
# Running it only if we are running it directly
# from the file... not by importing
if __name__ == "__main__":
app.run(debug=True)
You should use Py Code because it could run Any python script In html Like this:
<py-script>print("Python in Html!")<py-script>
Im not sure if it could run modules like Ursina engine ect But what i know is
That It allows you to type Python in Html. You can check out its offical Site for more info.
We can use Python code in HTML files. We have to use Python’s libraries within our browsers.
As we use Pyscript, we don’t need to worry about deployments. Everything happens in a web browser. We can share our HTML files with anyone containing fancy dashboards or any chars data. They can directly run it in a web browser without any complex setup.
Pyscript allows us to write python code with the help of 3 main components:
- Py-env: It defines the python packages list which needs to run your
code.
- Py-script: In this tag, the user will write their python code.
- Py-repl: It will Create a REPL component. The REPL component
executes the code user enters and displays the result of the code in
the browser.
Let’s start:
<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
Our Hello world program will look something like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
<script defer src="https://pyscript.net/alpha/pyscript.js"></script>
<title>Python HTML app Hello World</title>
</head>
<body>
<py-script>
print("Hello World!")
</py-script>
</body>
</html>
This project is still in the alpha stage, so maybe we can see many more new things in the upcoming days. Let know more about how to use python in HTML file.
Currently I have some Python files which connect to an SQLite database for user inputs and then perform some calculations which set the output of the program. I’m new to Python web programming and I want to know: What is the best method to use Python on the web?
Example: I want to run my Python files when the user clicks a button on the web page. Is it possible?
I started with Django. But it needs some time for the learning. And I also saw something called CGI scripts. Which option should I use?
You can’t run Python code directly
You may use Python Inside HTML.
Or for inside PHP this:
http://www.skulpt.org/
It probably would depend on what you want to do. I personally use CGI and it might be simpler if your inputs from the web page are simple, and it takes less time to learn. Here are some resources for it:
However, you may still have to do some configuring to allow it to run the program instead of displaying it.
Here’s a tutorial on that: Apache Tutorial: Dynamic Content with CGI
If your web server is Apache you can use the
mod_python module in order to run your Python CGI scripts.
You are able to run a Python file using HTML using PHP.
Add a PHP file as index.php:
<html>
<head>
<title>Run my Python files</title>
<?PHP
echo shell_exec("python test.py 'parameter1'");
?>
</head>
Passing the parameter to Python
Create a Python file as test.py:
import sys
input=sys.argv[1]
print(input)
Print the parameter passed by PHP.
Thanks to WebAssembly and the Pyodide project, it is now possible to run Python in the browser. Check out this tutorial on it.
Update: Pyodide v0.21.0
(async () => { // create anonymous async function to enable await
var output = document.getElementById("output")
var code = document.getElementById("code")
output.value = 'Initializing...n'
window.pyodide = await loadPyodide({stdout: addToOutput, stderr: addToOutput}) // redirect stdout and stderr to addToOutput
output.value += 'Ready!n'
})()
function addToOutput(s) {
output.value += `${s}n`
output.scrollTop = output.scrollHeight
}
async function evaluatePython() {
addToOutput(`>>>${code.value}`)
await pyodide.loadPackagesFromImports(code.value, addToOutput, addToOutput)
try {
let result = await pyodide.runPythonAsync(code.value)
addToOutput(`${result}`)
}
catch (e) {
addToOutput(`${e}`)
}
code.value = ''
}
<script src="https://cdn.jsdelivr.net/pyodide/v0.21.3/full/pyodide.js"></script>
Output:
<textarea id="output" style="width: 100%;" rows="10" disabled=""></textarea>
<textarea id="code" rows="3">import numpy as np
np.ones((10,))
</textarea>
<button id="run" onclick="evaluatePython()">Run</button>
Old answer (related to Pyodide v0.15.0)
const output = document.getElementById("output")
const code = document.getElementById("code")
function addToOutput(s) {
output.value += `>>>${code.value}n${s}n`
output.scrollTop = output.scrollHeight
code.value = ''
}
output.value = 'Initializing...n'
// Init pyodide
languagePluginLoader.then(() => { output.value += 'Ready!n' })
function evaluatePython() {
pyodide.runPythonAsync(code.value)
.then(output => addToOutput(output))
.catch((err) => { addToOutput(err) })
}
<!DOCTYPE html>
<head>
<script type="text/javascript">
// Default Pyodide files URL ('packages.json', 'pyodide.asm.data', etc.)
window.languagePluginUrl = 'https://cdn.jsdelivr.net/pyodide//v0.15.0/full/';
</script>
<script src="https://cdn.jsdelivr.net/pyodide//v0.15.0/full/pyodide.js"></script>
</head>
<body>
Output:
</div>
<textarea id='output' style='width: 100%;' rows='10' disabled></textarea>
<textarea id='code' rows='3'>
import numpy as np
np.ones((10,))
</textarea>
<button id='run' onclick='evaluatePython()'>Run</button>
<p>You can execute any Python code. Just enter something
in the box above and click the button.
<strong>It can take some time</strong>.</p>
</body>
</html>
There is a way to do it with Flask!
Installation
First you have to type pip install flask.
Setup
You said when a user clicks on a link you want it to execute a Python script
from flask import *
# Importing all the methods, classes, functions from Flask
app = Flask(__name__)
# This is the first page that comes when you
# type localhost:5000... it will have a tag
# that redirects to a page
@app.route("/")
def HomePage():
return "<a href='/runscript'>EXECUTE SCRIPT </a>"
# Once it redirects here (to localhost:5000/runscript),
# it will run the code before the return statement
@app.route("/runscript")
def ScriptPage():
# Type what you want to do when the user clicks on the link.
#
# Once it is done with doing that code... it will
# redirect back to the homepage
return redirect(url_for("HomePage"))
# Running it only if we are running it directly
# from the file... not by importing
if __name__ == "__main__":
app.run(debug=True)
You should use Py Code because it could run Any python script In html Like this:
<py-script>print("Python in Html!")<py-script>
Im not sure if it could run modules like Ursina engine ect But what i know is
That It allows you to type Python in Html. You can check out its offical Site for more info.
We can use Python code in HTML files. We have to use Python’s libraries within our browsers.
As we use Pyscript, we don’t need to worry about deployments. Everything happens in a web browser. We can share our HTML files with anyone containing fancy dashboards or any chars data. They can directly run it in a web browser without any complex setup.
Pyscript allows us to write python code with the help of 3 main components:
- Py-env: It defines the python packages list which needs to run your
code. - Py-script: In this tag, the user will write their python code.
- Py-repl: It will Create a REPL component. The REPL component
executes the code user enters and displays the result of the code in
the browser.
Let’s start:
<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
Our Hello world program will look something like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
<script defer src="https://pyscript.net/alpha/pyscript.js"></script>
<title>Python HTML app Hello World</title>
</head>
<body>
<py-script>
print("Hello World!")
</py-script>
</body>
</html>
This project is still in the alpha stage, so maybe we can see many more new things in the upcoming days. Let know more about how to use python in HTML file.