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When I try to use the sendData function, I get an error stating that nonObject has write_characteristic_value.

class bellRinger (object):
    def __init__(self):
        self.peripheral = None
        self.characteristic = None

    def did_discover_peripheral(self, p):
        if p.name and 'School Bell' in p.name and not self.peripheral:  #Change Name Here
            self.peripheral = p
            peripheral = p
            cb.connect_peripheral(p)

    def did_connect_peripheral(self, p):
        p.discover_services()

    def did_fail_to_connect_peripheral(self, p, error):
        print('Failed to Connect')

    def did_disconnect_peripheral(self, p, error):
        self.peripheral = None

    def did_discover_services(self, p, error):
        for s in p.services:
            if s.uuid == 'FFE0':
                p.discover_characteristics(s)

    def did_discover_characteristics(self, s, error):
        for c in s.characteristics:
            if c.uuid == 'FFE1':
                self.characteristic = c
                characteristic = c
                self.peripheral.set_notify_value(c, True)

    def did_update_value(self, c, error):
        print('Got Something',c.value)

    def sendData():
        c = self.characteristic
        self.peripheral.write_characteristic_value(c, 'ring/', True)

mngr = bellRinger()
cb.set_central_delegate(mngr)
cb.scan_for_peripherals()
mngr.sendData()

Strangely enough it does work if called from a button action....

not strange at all -- you are calling sendData before the characteristic has been discovered.

You may want to have

while mngr.characteristic is None:
    time.sleep(1)
mngr.sendData()

Thank you!!!!!!!