File: textbox_filter_numbers.py

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python-guizero 1.4.0%2Bdfsg-1
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from guizero import App, TextBox, Text

def filter_numbers():
    numeric_filter = filter(str.isdigit, textbox.value)
    textbox.value = "".join(numeric_filter)

app = App()
text = Text(app, text="Enter numbers only")
textbox = TextBox(app, width=40, command=filter_numbers)
app.display()