def __init__(self,
device=None,
manufacturer=None,
model=None,
device_manager=None):
"""
Instantiates a Scale object.
If no arguments are passed, it wraps itself around whatever device
calling `device_manager.find` returns and automatically fills in
its `manufacturer` and `model` properties according to what
`device_manager.get_manufacturer` and `device_manager.get_model`
return, respectively.
If a `device` argument is passed, the Scale object wraps it and
treats it like a PyUSB device.
If a `device` argument is passed and `manufacturer` and/or `model`
are omitted, the Scale object will query the `device_manager` object
to discover and populate the Scale's `manufacturer` and `model`
properties.
If `manufacturer`, and/or `model` are passed and `device` is omitted,
Scale will wrap the device returned when those arguments are passed
to `device_manager.find`.
If `manufacturer`, and/or `model`, and `device` are all passed,
then the Scale object wraps `device` and sets its own `manufacturer`,
`model`, and `name` properties accordingly, regardless of `device`'s
*actual* manufacturer and model.
If a `device_manager` argument is passed, it uses that object
instead of a ScaleManager instance to find the attached scale.
"""
if not device_manager:
device_manager = ScaleManager()
device = device_manager.find(manufacturer=manufacturer, model=model)
if not manufacturer and device:
manufacturer = device_manager.get_manufacturer(device)
if not model and device:
model = device_manager.get_model(device)
self._device = device
self._model = model
self._manufacturer = manufacturer
self._manager = device_manager
self._endpoint = None
self._last_reading = None
# Initialize the USB connection to the scale.
if self.device:
self.connect()
def __init__(self, device=None, manufacturer=None, model=None, device_manager=None):
"""
Instantiates a Scale object.
If no arguments are passed, it wraps itself around whatever device
calling `device_manager.find` returns and automatically fills in
its `manufacturer` and `model` properties according to what
`device_manager.get_manufacturer` and `device_manager.get_model`
return, respectively.
If a `device` argument is passed, the Scale object wraps it and
treats it like a PyUSB device.
If a `device` argument is passed and `manufacturer` and/or `model`
are omitted, the Scale object will query the `device_manager` object
to discover and populate the Scale's `manufacturer` and `model`
properties.
If `manufacturer`, and/or `model` are passed and `device` is omitted,
Scale will wrap the device returned when those arguments are passed
to `device_manager.find`.
If `manufacturer`, and/or `model`, and `device` are all passed,
then the Scale object wraps `device` and sets its own `manufacturer`,
`model`, and `name` properties accordingly, regardless of `device`'s
*actual* manufacturer and model.
If a `device_manager` argument is passed, it uses that object
instead of a ScaleManager instance to find the attached scale.
"""
if not device_manager:
device_manager = ScaleManager()
device = device_manager.find(manufacturer=manufacturer, model=model)
if not manufacturer and device:
manufacturer = device_manager.get_manufacturer(device)
if not model and device:
model = device_manager.get_model(device)
self._device = device
self._model = model
self._manufacturer = manufacturer
self._manager = device_manager
self._endpoint = None
self._last_reading = None
# Initialize the USB connection to the scale.
if self.device:
self.connect()
