Taipy read and write functions

Question

I read the user manual, and I just don’t get what read_fct and write_fct expect for parameters and what format they are supposed to return (for write_fct, I don’t even know what to return).

I wrote read_fct to send back a list of tuples I pulled from the Data Base, the data I want to look at, and with write_fct I don’t know what to do.

Could you please give a little example to explain how it’s supposed to work?

thank you for your help

regards

Answer 1

Here is an example of code you can use to understand how it works:

from taipy.config import Config

def read_data(path):
    return pd.read_csv(path)

def write_data(data, path):
    pd.DataFrame(data).to_csv(path)

generic_data_node_cfg = Config.configure_generic_data_node(id="my_data_node",
                                                         read_fct=read_data,
                                                         write_fct=write_data,
                                                         read_fct_params=["res.csv"],
                                                         write_fct_params=["res.csv"])

You also have to be aware of your types. The task function receives the type given by read_data. The type returned by the task function should be correct for write_data to work.

In other words, this line of code below should work with "foo" and "bar" optional and function(), your normal Python function used by your task.

write_data(function(read_data("foo")), "bar")

You can also find the documentation here for more explanation.