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numerical operations:classes python
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class method | instatantiation
__add___  | self + other
__sub___  | self - other
__mul___  | self * other
__div___  | self / other
__floordiv___  | self // other
__mod___  | self % other
__divmod___  | self divmod other
__lshift___  | self << other
__rshift___  | self >> other
__and___  | self & other
__or___  | self | other
 right : Numerical operations    
__radd___  | self + other
__rsub___  | self - other
__rmul___  | self * other
__rdiv___  | self / other
__rfloordiv___  | self // other
__rmod___  | self % other
__rdivmod___  | self divmod other
__rlshift___  | self << other
__rrshift___  | self >> other
__rand___  | self & other
__ror___  | self | other
see: vec2d ,class, __rmul__