Can't either A) read a HA file or B) write a new text file. Need to do both

[TrevskiUK]

Hi everyone,

New to this add-on, and struggling.

Here is my code:

def userproc(action=None, id=None):
    """userproc using pyscript."""
    log.info(f"userproc: got action {action} id {id}")

    import json
    # Write out to our file
    with open("/homeassistant/myah/outbox/userproc_out.myah", "w") as txt_file:
        txt_file.write('made it this far: 01')

    # Define the path to the auth file
    file_path = "/homeassistant/.storage/auth"

    parsed_data = None

    with open(file_path, "r", encoding="utf-8") as file:
        parsed_data = json.load(file)

    print(parsed_data)

    # Use a list comprehension to extract the "id" key from each user block
    user_ids = [user["id"] for user in parsed_data["data"]["users"]]

When run from HA Developer Actions,:

1. No text file is written "/homeassistant/myah/outbox/userproc_out.myah"

2. Something is not working with the JSON parsing of the file "/homeassistant/.storage/auth", as I get the following in the log:

2026-06-19 21:03:10.680 ERROR (MainThread) [custom_components.pyscript.file.userproc] 
  File "/config/custom_components/pyscript/decorators/service.py", line 109, in do_service_call
    return await func.call(ast_ctx, **data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/config/pyscript/userproc.py", line 30, in userproc
    user_ids = [user["id"] for user in parsed_data["data"]["users"]]
                                       ~~~~~~~~~~~^^^^^^^^
TypeError: 'NoneType' object is not subscriptable

This is all very frustrating because my original standalone version of the script works perfectly when executed from the HA terminal.
Aaargh.

Thanks in advance!

[daveshenal]

Hii TrevskiUK,

The root cause is that PyScript deliberately doesn't support built in functions like open, read, and write to avoid blocking the main event loop and for security reasons so open() simply isn't available in pyscript context, which is why parsed_data stays None and you get the TypeError.

You could use io.open via task.executor

import io, json, os

@pyscript_executor
def write_file(path, content):
    os.makedirs(os.path.dirname(path), exist_ok=True)
    with io.open(path, "w") as f:
        f.write(content)

@pyscript_executor
def read_json(path):
    with io.open(path, "r", encoding="utf-8") as f:
        return json.load(f)

def userproc(action=None, id=None):
    write_file("/homeassistant/myah/outbox/userproc_out.myah", "made it this far: 01")
    parsed_data = read_json("/homeassistant/.storage/auth")
    user_ids = [user["id"] for user in parsed_data["data"]["users"]]
    log.info(f"user_ids: {user_ids}")

Or put file I/O in a separate native python module in a directory outside config/pyscript/, then import and call it via task.executor.

The @pyscript_executor decorator handles wrapping the function in task.executor automatically. Note that allow_all_imports: true must be set in your pyscript config.