Math Module log10 cannot be used

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@Terry666 You can derive that from math.log()
math.log10(x) = math.log(x)/math.log(10)
math.log2(x) = math.log(x)/math.log(2)
Since math.log(10) and math.log(2) are constant, you can precalculate them.
P.S.: Looking at the code, they are not included in the PyCom build. You can do so by building you own firmware and setting
#define MICROPY_PY_MATH_SPECIAL_FUNCTIONS (1)
in mpconfigport.h.