Hi, I saw that a new modules for physics began to be implemented, and the part which interested me was on the physical units: for a project I tried to write my own classes, inspired by those in ScientificPython, but evidently it was not compatible with sympy, and so I thought and tried to inspired from the classes in sympycore, without successes. But yet, with a better understanding of sympy, I read the recent implementation and had few questions and observations: the actual way is useful to make symbolic computations with units, but it is convenient when we want to work with units, e.g. to convert a quantity in one unit into another, or to take into account the dimension of units. So I was wondering me if it was not possible to merge actual and ScientificPython approaches. For my project I tried several ways, the latest was to create classes for the dimension (a tuple), the unit symbol (like actual unit) and for the unit; the latest having a symbol, a factor and a dimension — something like that (I still search the best way to arrange).
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