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import numpy as np# 保存二维数组或矩阵class MyNumPyExport(object):    def __init__(self):        setattr(self, 'file', 'default.out')        setattr(self, 'numpy_to_export', np.array([]))    def set_file_name(self, file):        setattr(self, 'file', file)    def export(self, nums):        fid = open(self.file, 'a')  # 追加模式，新增内容增加到末尾        fid.write('\n[')        nums_lst = nums.tolist()        for ite in nums_lst[0:-1]:            cell = ','.join(str(p) for p in ite)            fid.write('[' + cell + '],\n')        cell = ','.join(str(p) for p in nums_lst[-1])        fid.write('[' + cell + ']]\n')        fid.close()if __name__ == '__main__':    test_array = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])    test_matrix = np.matrix([[9, 8, 7], [6, 5, 4], [3, 2, 1]])    ins_mynp_exp = MyNumPyExport()    ins_mynp_exp.set_file_name('test.txt')    ins_mynp_exp.export(test_array)