Run brushless motor with esc

Question

I have looked all over the internet on how to run a brushless motor with an esc through RPi.GPIO and have no results. I have tried simply wiring the esc as it is supposed to be and programming it through PWM. Here is what I have so far:

joystick_count = pygame.joystick.get_count()

        for i in range(joystick_count):
                joystick = pygame.joystick.Joystick(i)
                joystick.init()

                axes = joystick.get_numaxes()
                axes_list = []

                for j in range(axes):
                        axis = joystick.get_axis(j)
                        axes_list.append(round(axis, 1))

                M_out = (-axes_list[3] + 1) / 2

                print(M_out * 100)

                M_thrust.ChangeDutyCycle(M_out * 100)

Can anyone help me?