What is the recommended way to make uploaded content using file_selector available to main.py?

Question

I am experimenting with file_selector to upload a yaml file and want to make the uploaded content available to my main.py program and view the content on my webpage. Currently I defined a global variable that holds the read content like below:

from taipy.gui import Gui
import yaml

parsed_data = dict()

path = None

md = "<|{path}|file_selector|label=Upload file|on_action=load_yaml_file|extensions=.yaml|>"

def load_yaml_file(state):
    global parsed_data

    with open(state.path, 'r') as file:
        yaml_data = file.read()

    # Parse the YAML data into a dictionary
    parsed_data = yaml.safe_load(yaml_data)

# other stuff

Gui(md).run()

What are other options instead of using a global variable?

Answer 1

You should use the state to display your variables.

Check out this section of the documentation to understand the state.

The state holds the value of all the variables used in the user interface for one specific connection.

from taipy.gui import Gui
import yaml

parsed_data = dict()
parsed_data_str = ""

path = None

md = """
<|{path}|file_selector|label=Upload file|on_action=load_yaml_file|extensions=.yaml|>

<|{parsed_data_str}|input|active=False|multiline|>
"""

def load_yaml_file(state):
        with open(state.path, 'r') as file:
            yaml_data = file.read()

        # Parse the YAML data into a dictionary
        state.parsed_data = yaml.safe_load(yaml_data)
        state.parsed_data_str = yaml_data # you will see your yaml file as a string

# other stuff

Gui(md).run()

Now, you can retrieve state.parsed_data with what you have put inside. The state is always a parameter of callbacks in Taipy.

I also tried to include the answer on the page.