There are several ways to implement properties of sympy objects. The
simplest one is:
```
def __new__(*args):
obj = Basic(*args)
obj.prop = 'some_property'
```
A slightly more complicated one is:
```
def __new__(*args):
obj = Basic(*args)
obj._prop = 'some_property'
@property
def prop(self):
return self._prop
```
The first method is simpler and shorter, but the second one explicitly
forbids assignments `obj.prop = ...`. I have tried looking into various
sympy modules and the practices are different. Which implementation is
preferable? And on a more general topic, is there a "coding guidelines"
webpage, where issues like this should be resolved once and for all? Maybe
it makes sense to create one? I believe it will improve both the code and
user experience.
Best Regards,
Denys Rybalka
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