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from gpiozero import Button
from signal import pause

def say_hello():
    print("Hello!")

button = Button(2)

button.when_pressed = say_hello

pause()

The above code works nicely in when I run it in the terminal by python ./button.py. It also works nicely in mu-editor in the first run in mu-editor. But when I stop the programme in mu-editor and rerun the same script, it prompts the error RuntimeError: Failed to add edge detection. Am I wrong in some settings?

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I found a solution.

[SOLVED] gpiozero Button - Runtime Error - edge detection - Raspberry Pi Forums

I think I've fixed it in the latest development RPi.GPIO. It turns out that the GPIOs weren't getting cleaned up properly under Thonny and a recent bugfix to RPi.GPIO unmasked the problem.

I will release RPi.GPIO 0.6.5 in the next few days. If you can't wait that long then install the latest development RPi.GPIO (in Raspbian Squeeze):

$ sudo apt-get install python-dev python3-dev
$ sudo apt-get install mercurial
$ sudo apt-get install python-pip python3-pip
$ sudo apt-get remove python-rpi.gpio python3-rpi.gpio
$ sudo pip install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO
$ sudo pip3 install hg+http://hg.code.sf.net/p/raspberry-gpio-python/code#egg=RPi.GPIO

To revert back to the default version in Raspbian:

$ sudo pip uninstall RPi.GPIO
$ sudo pip3 uninstall RPi.GPIO
$ sudo apt-get install python-rpi.gpio python3-rpi.gpio
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