def make_zero(self, zeros=1):
        zero_string = ''

        for i in range(zeros):
            zero_string += '0'

        return zero_string
Solves Vandermonde design matrix for approximating polynomial coefficients
dataset/ETHPy150Open travishathaway/python-ach/ach/data_types.py/Ach.make_zero--crossover with--dataset/ETHPy150Open sunlightlabs/clearspending/completeness/statlib/matfunc.py/polyfit