Python upload image and save it at database sqlite3

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Python

I am creating my first GUI software, I need to know How to create a function that allows users to upload pictures from their system and insert them into the database.

What I have tried:

def filedialogs(self):
        global get_img
        get_img = filedialog.askopenfilename(filetypes=(("png","*.png"),("jpg","*.jpg"),("Allfile","*.*")))

def convert_image_into_binary(self):
        with open(get_img, 'rb') as file:
        self.photo_image=file.read()
        return photo_image