[Python] Tkinter Python Filedialog Certain Files Only?

So I was messing around with the python keyboard module and then I wondered how do I make a file dialog popup when you pressed ctrl+S so I searched stack overflow I quickly found out how to with:

from tkinter import filedialog

root = tk.Tk()
root.withdraw()

file_path = filedialog.askopenfilename()


But what I want to know is how can I filter out the files by like *.txt or *.py with the same method. So if anyone has an answer please tell me.

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