Update a label text from subprocess

[jim53]

Thank you for the reply but I not problem to execute esptool with program.
The problem that I have is that the output is redirected to a PIPE but the text of label is only updated when the subprocess.popen is completed. I would like to update the text of the label each time a new character arrived in stdout to have a dynamic update.
I hope you understand my problem. It is "just" a display problem.

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I have found a solution.
I have just add

self.update()

after

self.lab.configure(text=self.result)

and now the text of the label is dynamicaly updated.