Importing JS Objects in Python

PyScriptPyodide

The PyScript (Pyodide) and PyScript(Micropython) version of this recipe are identical,

In PyScript, the object window in the pyscript namespace is a proxy for the JavaScript Global Scope of the main thread That is to say, if we have an variable in the JavaScript global scope of the main (window) thread:

<script>
    // Create a JavaScript global variable called my_string
    var my_string = "Hello, world"
</script>

We can access it (and in this case, print the string it represents) using either any of the following Python syntax options:

import pyscript
print(pyscript.window.my_string)

or

from pyscript import window
print(window.my_string)

Tip

These examples work regardless of whether the code is run in the main thread or a worker thread - pyscript.window always references the global scope of the main thread. If you need access to the global scope of a worker thread, use import js, which is a proxy for the global scope of the thread the code is running in.

In Pyodide, the pseudo-module js is a proxy for the JavaScript Global Scope of the thread the code is currently running in. That is to say, if we have an variable in the JavaScript global scope:

<script>
    // Create a JavaScript global variable called my_string
    var my_string = "Hello, world"
</script>

We can access it (and in this case, print the string it represents) using either any of the following Python syntax options:

import js
print(js.my_string)

from js import my_string
print(my_string)