[OTHER] Bind to dictionary key within class

[JosuaCarl]

What would you like to share or ask?

I am failing to write info to a value that is bound to an entry in a dictionary, which is nested in a class. I saw an example of using a dictionary in #1785 , but am failing, when the dictionary is in a class, other than global.

Minimal example:

from taipy.gui import Gui
import taipy.gui.builder as tgb

class Simple_Class:
    def __init__(self):
        x = 1

class Complex_Class:
    def __init__(self):
        self.dictionary = {}
        self.simple_class = Simple_Class()

complex_class = Complex_Class()
simple_dictionary = {}

def printer(state, var_name, value):
    print(state.complex_class.simple_class.x)
    print(state.complex_class.dictionary.items())
    print(state.simple_dictionary.items())

with tgb.Page() as page:
    tgb.input(
        value="{complex_class.dictionary.x}",
        on_change=printer,
    )
    tgb.input(
        value="{complex_class.simple_class.x}",
        on_change=printer,
    )
    tgb.input(
        value="{simple_dictionary.x}",
        on_change=printer,
    )

Gui(page).run(port=4999)

The following output is produced, when entering 1,2 and 3 into the resulting fields.

.../.venv/lib/python3.12/site-packages/taipy/gui/gui.py:700: TaipyGuiWarning: A problem occurred while resolving variable 'complex_class.dictionary.x' in module 'main'.
_warn(
.../.venv/lib/python3.12/site-packages/taipy/gui/utils/_evaluator.py:371: TaipyGuiWarning: Exception raised evaluating complex_class.dictionary.x:
'dict' object has no attribute 'x'
_warn(f"Exception raised evaluating {expr_string}", e)
2
dict_items([])
dict_items([])
2
dict_items([])
dict_items([('x', '3')])

As demonstrated, even deep nested properties are able to be used, so it seems possible in principle, but evaluated differently in praxis.

Do you know of a workaround and could this be covered in future releases?

Code of Conduct

• I have checked the existing issues.
• I am willing to work on this issue (optional)

[FlorianJacta]

from taipy.gui import Gui
import taipy.gui.builder as tgb


class Simple_Class:
    def __init__(self):
        self.x = 1


class Complex_Class:
    def __init__(self):
        self.dictionary = {"x": 1}
        self.simple_class = Simple_Class()


complex_class = Complex_Class()
simple_dictionary = {"x": 1}


def printer(state, var_name, value):
    print(state.complex_class.simple_class.x)
    print(state.complex_class.dictionary.items())
    print(state.simple_dictionary.items())


with tgb.Page() as page:
    tgb.input(
        value="{complex_class.dictionary.x}",
        on_change=printer,
    )
    tgb.input(
        value="{complex_class.simple_class.x}",
        on_change=printer,
    )
    tgb.input(
        value="{simple_dictionary.x}",
        on_change=printer,
    )

Gui(page).run(port=4999)

I have used this code and had the same issue. This is the error I get when updating complex_class.dictionary.x:

C:\Users\jacta\OneDrive\Bureau\Go\.venv\Lib\site-packages\taipy\gui\utils\_evaluator.py:371: TaipyGuiWarning: Exception raised evaluating complex_class.dictionary.x:
'dict' object has no attribute 'x'
  _warn(f"Exception raised evaluating {expr_string}", e)