Unable to externally load script via src=""

For some reason, I get this brython.js:5183 Access to XMLHttpRequest at '../basichow/test.py?1572494543087' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https. This occurs when I added the src="test.py" to the <script type="text/python"></script> Using Chrome and Brython.js version 8. The files are here. basichow.zip Any help be appreciated, thanks.

[PierreQuentel]

This is already possible with Brython packages. If you run python -m brython --make_package test in the application directory, it generates the Javascript program test.brython.js that you can load with

<script src="test.brython.js"></script>

and then execute the code in main.py by

<script type="text/python">
import main
</script>

In this case there is no Ajax call, so the page will work with the file protocol. You can transfer the application files to a mobile phone and open the page, it will work 😃

[PierreQuentel]

You have probably modified test.py with something like

open("data here.txt")

The Python function open() is also implemented in Brython with an Ajax call (browsers don’t have access to the computer file system). The call is blocking (ie not asynchronous) because the Python function is also blocking; this causes the deprecation message, but you can ignore it (cf. the Brython FAQ for more information). And the call fails anyway because the protocol is file.

For the moment there is no real solution to this problem (you could put the file content inside a string in a Python script and import it, but that’s ugly…). I will try to find something better, I will keep you informed.