Reading pushbutton statuses with digital inputs and the mraa library

We will create a new PushButton class to represent a pushbutton connected to our board that can use either a pull-up or a pull-down resistor. The following lines show the code for the new PushButton class that works with the mraa library. The code file for the sample is iot_python_chapter_05_01.py.

import mraa
import time
from datetime import date

class PushButton:
    def __init__(self, pin, pull_up=True):
        self.pin = pin
        self.pull_up = pull_up
        self.gpio = mraa.Gpio(pin)
        self.gpio.dir(mraa.DIR_IN)

    @property
    def is_pressed(self):
        push_button_status = self.gpio.read()
        if self.pull_up:
            # Pull-up resistor connected
            return push_button_status == 0
        else:
            # Pull-down resistor connected
            return push_button_status == 1

    @property
    def is_released(self):
        return not self.is_pressed

We have to specify the pin...