MicroPython Forum (Archive)

I just realized there is a gotcha if the struct layout is nested. In that case, the overloaded __getattr__ will be called with the top-level attribute name only whenever a nested attribute is being get or set. As a result, on a nested attribute 'get', the I2C logic won't have the correct information...

Yeah, that seems like a good option.

In the closure approach, does each instance store a separate identical copy of _get/_set in memory vs. normal methods that are stored once on the class?

FYI, looks like I'm not the first person to want to do something like this https://github.com/micropython/micropyt ... -466670063

Great idea! You actually don't need to do anything special for __getattr__ since it will only get called if the attribute is not found "normally" (https://docs.python.org/3/reference/datamodel.html#object.__getattr__). That saves you from having to type all the "if" checks for the attributes stored ...

I'm trying to implement a Register class which allows direct access to bitfields on a register. I need it to work identical to attribute access on a uctypes.struct bitfield, but I need to read/write to an I2C device behind the scenes whenever the bitfield attributes are accessed. i.e. something like...

CPython doesn't allow subclassing memoryview: >>> class MyMV(memoryview): ... pass ... Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: type 'memoryview' is not an acceptable base type but MicroPython does: >>> class MyMV(memoryview): ... pass >>> I'm curious if anyb...

Thanks for the explanations! Each statement executed on the REPL kind of like making a file containing that statement and compiling it. I didn't realize this was how the REPL worked. For anyone else coming across this later, this example makes it pretty clear: >>> _B = const(2) >>> _B Traceback (mos...

Can someone help me understand why private const() variables aren't defined?

FYI, I think the if __debug__ logic in your code is backwards, i.e. should be: try: if __debug__: import logging logger = logging.getLogger(__name__) else: logger = None except ImportError: logger = None The more elaborate approach also requires the check for isEnabledFor before any call to logger.d...

@stijn thanks for the reply. I should have mentioned I'm already using the logging.py module from micropython-lib which essentially does what I need it to do from a debug perspective. The main issue I was originally trying to get at in my OP was how to handle the fact that logging.py may or may not ...