There is a Python interpreter in naclports (to run as Google Chrome Native Client App).
Are there any examples for bundling the interpreter with a custom Python application and how to integrate this application with a HTML page?
The interpreter is currently the only python example in naclports. However, it should be possible to link libpython into any nacl binary, and use it just as you would embed python in any other C/C++ application. A couple of caveats: you must initialize nacl_io before making any python calls, and as you should not make python calls on the main (PPAPI) thread.
In terms of interacting with the HTML page, as with all NaCl applications this must be done by sending messages back and forth between native and javascript code using PostMessage(). There is no way to directly access the HTML or JavaScript from native code.
Related
I'm trying to integrate backend code into a Wix site. Im not too picky about how I want to do this, or what language to write in (ideally, I have a locally-hosted Java code that I'd love to simply call). I wouldn't mind re-writing it in JavaScript though, or another language. But before I decide that I'm confused about my options. I can code but I'm new to the concepts like modules, APIs, & servers.
According to my research, back-end code with Wix is supposed to be easy (or at least do-able and not THAT complicated)....
From this webpage https://support.wix.com/en/article/corvid-calling-server-side-code-from-the-front-end-with-web-modules,
"Web modules are exclusive to Corvid and enable you to write functions that run server-side in the backend, and easily call them in your client-side code. With web modules you can import functions from backend into files or scripts in public, knowing they will run server-side. Corvid handles all the client-server communication required to enable this access."
And from this: https://www.sitepoint.com/what-is-wix-code/
"It’s serverless: All this added functionality comes in a serverless environment that lets you get your work done without any of the normal full-stack development headaches.
Just code and go: Wix Code has a built-in, online IDE and backend so you can just add the code you need to your page or your site, publish, and you’re live."
So, I thought they have a backend IDE where I can write backend code directly, or I could call my Java program. But, as I tried doing this and finding tutorials, it seems I can really only do this by calling a public API from the backend...?
https://youtu.be/tuu0D1izrUU
But ive also read (and someone who supposedly has done it before told me this) that Wix integrates with node.js, which is a backend version of JavaScript.
Can I use a Wix domain for a NodeJS app?
But, when I go into my Wix site I cannot find any option for using Node JS, and doing research on that gives me no useful results.
So, I'm thoroughly confused on what the capabilities are here. Can someone help me make sense of this?
Why are there no tutorials showing explicit code in the Corvid backend module? What's stopping me from simply writing my Java program there in a module? Do I really need an API endpoint to call and pass to the front end?
Is Node JS supported or not - has anyone done this before?
Also, in one link above they said everything is "serverless". But if I have to set up my own API endpoint won't I need to set up my own server??
There are basically two ways to go about this, which you seem to have already discovered.
Write your backend code in your Wix site. Indeed, the backend is built on Node.js as you can see here. Using this approach you will have to use JavaScript. As you seem to have found, you write this code in the Backend section of your site in a Web Module. Pros: you don't need to worry about managing a server and all your code is in one place.
Expose your already existing Java code as an API that your Wix site can call using the wix-fetch API. Pros: you don't need to rewrite your code.
Need advice on how to incorporate Python into an Azure ASP.NET web application environment. Please excuse this question but I am new to Azure and I'm not clear on how to proceed. Every option that I look into looks promising but they all seem to have their own issues. Below is a more thorough explanation but the deal is that I have an Azure account with all kinds of goodies, a full fledged ASP.NET (C#) web app running via App Service, I am new to Azure (but not Python), and I'm hoping to add Python functionality to this whole setup. In short:
I want to add Python to this setup mainly to run scheduled jobs and also to trigger Python code from ASP.NET web form submissions
ideally I want a solution that resembles a non-cloud setup. I know this sounds silly but I'm finding the cloud/Azure functionality to be nuanced and not straightforward. I want a place to put a bunch of Python scripts, run, edit, schedule and trigger them from ASP.NET
for example: I created a WebJob that runs manually and from the documentation it wasn't clear how it should be called. I just figured out that you need to POST with Basic Auth (and the credentials provided).
!Also, Azure CMD does NOT like files with 'underscore _' in them! You cannot submit a Web Job with a py file with an underscore nor can you write output with a file with an underscore
!Also, I don't see an option for this Web Job to run Python 3.6.4 (which I installed via extension). Right now it is using 2.7.15...
!Also, CRON expression in Azure has six *, not five plus a command. Again, more weird stuff to worry about
I tried these instructions but the updates to the web page's Web.config file breaks the ASP.NET web pages
ideally the most cost effective option
Any info is greatly appreciated
MORE DETAILED EXPLANATION
Currently I have an ASP.NET site running via Azure App Service and I would like to add Python scripts and possibly Flask/Rest functionality. Note that I am not expecting to serve any content via Python and will largely be running Python scripts either on a scheduled basis or call them from ASP.NET. As a matter of fact, and this is an important point, I'm hoping to have ASP.NET trigger/run a Python script when a web form is submitted. I realize that I could get a similar effect if I make a web call to a Rest api that is running Python. In any event, I can't tell if I should:
add a Python extension to the current App Service running the web page (I tried this) OR
I did install Python 3.6.4 and some packages via pip
These instructions were useful, however the updates to the web page's Web.config file breaks the ASP.NET web pages
set up a VM that will have all of the Python code (but how can I have the .NET web page(s) call the Python in the VM?) OR
use Azure functions (I'm completely new to this and must admit that I prefer to have my old school Python environment instead although I see the benefit of using functions. But how do you deal with logging and debugging?)
or what about a custom windows container (Docker)?
This requires installing VS Code and that is OK but I'm looking for a solution that another user can get into with as few interruptions as possible
The idea is to ramp up the use of Python although, like I said, I don't expect Python to be serving any of the web content. It will be used to run in the background and to run scheduled jobs. What is the most robust and hopefully easiest way to add Python functionality to Azure (most importantly in a way to be able to trigger/use Python from an App Service running .NET?)? I've searched online and stack overflow so far with interesting finds but nothing to my liking.
For example, the following link discusses how to schedule WebJobs. I just created a manual one and when I called the webhook I got the message: "No route registered for '/api/triggeredwebjobs/TestPython/run'" How to schedule python web jobs on azure
The Docker method looks very promising, however, I'm looking for a simple solution as there is another person who will be involved in all of this and he's busy with other projects
Thank you very much!
I found a solution, though I'm open to more info. Like I mentioned in my post, I used the 'add extension' tool to add Python 3.6.4 to my Azure (installed in D:\home\python364x64).
Then I installed a bunch of packages via pip, these installed into D:\home\python364x64\Lib\site-packages.
I created a Python folder in webpages\Python where I put my scripts.
Finally, in ASP.NET I used the Diagnostics.Process call to run my code in ~\webpages\Python\somecode_2.py
The main issue is that Azure came with Python 2.7.15 installed. And for some reason when my Python code got executed it was using 3.4 (where that version came from beats me). So for each script, I had to create an _2.py version where I simply did the following in order to call the original script via Python 3.6.4. Looks a little nasty but it works. So like I said, I would welcome more info for ways to do this better...
--
import os<br>
os.system("D:\\home\python364x64\python.exe SomePython.py {0}".format(add arguments here)
Is it possible to create a user interface without the help of python framework (like tinker or pygame) and use only vanilla python code? If yes, how?
Can you briefly explain how python framework works?
Is the code of different python framework different?
If the computer did not have the framework installed, will the program still runnable if the program uses a framework?
Thanks very much
Yes, after all tinker and pygame are just python classes packaged as modules.
Python frameworks are a bunch of pre-tested and reusable modules that allow you to use and extend upon so you don't have to reinvent the wheel.
Yes, frameworks will have differences in usability and code.
The computer will always need the dependencies, though you can package these in various ways aka create a package that has all your dependencies for the program to run.
If you want as few external dependencies as possible (but still a GUI) I would strongly suggest using a Web-Microframework like bottle (single file) and utilize the user's browser for rendering.
You can make a GUI without any external framework with HTML by setting up a webserver and using the user's browser to render it.
For a browser-GUI without an external Framework: Depending on whether you know JavaScript you can either use XML-RPC (xmlrpc.server+http.server with JS in the browser) or WSGI (wsgiref) (example on that page)
Yes, totally.
Of course the if you do not prepare for this case you cannot run a program without an integral part of it like a Framework - but you can distribute your program with the Framework included.
For XML-RPC
import xmlrpc.server
import http.server
class MyHandler(xmlrpc.server.SimpleXMLRPCRequestHandler,http.server.SimpleHTTPRequestHandler):
pass
This handler will serve files from the current working directory (your actual HTML-UI and JS for communication (there are several XMP-RPC libraries for JS)) but it can also be used like in the XML-RPC-Server example to glue your code and the UI together.
How can I execute a Python script on a webpage?
I've used XAMPP to create the Apache server. Are there any tutorials/examples or guides on how to execute a .py script? I'm using Windows 7 and have installed Python on my local machine. If I access the .py script via the web link, it looks as if its HTML code and nothing is executed.
Typically, you don't execute Python in the browser. Instead, the browser accesses a resource (or "webpage", like http://example.com/mypage) by requesting the resource from the server. The server (for example, Apache), when administered correctly, passes off handling of the request to some Python script. Then, your Python script creates some output (for example, HTML) which the server then returns to the browser for the browser to display.
However, some web sites have found it useful to have logic (scripts) run in the browser, rather than on the server. The standard way of doing this is using JavaScript (although in the past there WERE other languages built into browsers, such as VBScript in Internet Explorer).
Right now, pretty much all browsers have settled on JavaScript as THE scripting language in the browser. In order for you to use any other language in the browser (including Python), the browser must support that scripting language (or needs to have an add-on to support that scripting language). Simply having Python installed on your client alongside the browser is not enough. For more information, please see the Python documentation Web Browser Programming.
Another option is to use something like Pyjs. This is a library that has you write your code in Python, and converts the necessary parts to JavaScript. This isn't exactly "Python in the browser", but it might be something you are looking for.
I guess this links will help....
https://community.apachefriends.org/f/viewtopic.php?t=42975
Usually a good resource for Python is the official documentation.
They do a great job of explaining many aspects of Python. Using Python on the web is a big part and they have a great overview.
Hi I want to deploy a matlab application on the web using python. Is there a way to do it.I have converted my application into jar files (java classes) as per the documentation on math works site. Can someone point me in the right direction to go ahead
The fact that your Matlab code is packaged up as Jars may not help that much here, at least not with pure Python.
There are a few ways you can take code written in Java and expose it to Python.
Jython
If you are willing to give Jython a shot this may be a really easy way to provide a Django interface to your jars.
Basically you'll get to write a normal Django App and also use Jython to work natively with your Jars. This could be the best of both worlds assuming you aren't tied to CPython.
Django-Jython
Java Compatibility Interfaces
On CPYTHON either of the following projects will help you work with the code in your Jar files:
JCC: Create a Python extension module that wraps your Jar file
JPype: Provides an API for running the JVM and calling into code running in that JVM from Python.
Separate Process:
If you have a standalone program written in Matlab (really any language) you could execute it as a child process of your Django application. You'd look into a simple web form in Django that allowed you to submit values to be inputs to this process and then in your view (after validating the form) you'd do something like:
command = "mymatlabprogram.exe %s"%(arg1,)
process = subprocess.Popen(command.split())
stdout, stderr = process.communicate()
Assuming that worked you could pull answers out of stdout or error messages out of stderr. You could serve an image created by that process, etc. Once something like this is working you could look into celeryd to extract the subprocess stuff from your web app.
The advantage of working with a separate process is that you isolate bugs in your Matlab code from breaking your web application and vice versus. The disadvantage is you have to serialize everything and work with multiple times between the client's browser and your web app, between the web app and the executable, and back to the client.