#! /usr/bin/env python# -*- coding: utf-8 -*-#def pprint(A): for i in A: print(i) print("")data = [ [1, 2, 1, 2], [3, 8, 1, 12], [0, 4, 1, 2]]n = len(data)print("输入数据")pprint(data)for i in range(n): print("第{}次操作".format(i)) maxE = abs(data[i][i]) # 最大值在第几行 maxRow = i for k in range(i + 1, n): if abs(data[k][i] > maxE): maxE = abs(data[k][i]) maxRow = k # 当前行交换最大的行 for k in range(i, n + 1): data[maxRow][k], data[i][k] = data[i][k], data[maxRow][k] print("当前行交换最大的行 交换结果") pprint(data) # 改0 for k in range(i + 1, n): c = -data[k][i] / data[i][i] print(-data[k][i] ,"/", data[i][i]) for j in range(i, n + 1): if i == j: data[k][j] = 0 else: data[k][j] += c * data[i][j] print("改0结果") pprint(data)# 化简后结果print("化简结果")pprint(data)# 结果计算result = [0 for i in range(n)]for i in range(n - 1, -1, -1): result[i] = data[i][n] / data[i][i] for k in range(i - 1, -1, -1): data[k][n] -= data[k][i] * result[i]print(result) 
