#--coding:utf-8--

import random
import itertools
from copy import deepcopy

def make_board(m=3):
 numbers = list(range(1,m**2+1))
 #可能出现的数字为1-9
 board = None
 #board是数度二维列表
 while board is None:
 board = get_board(m,numbers)
 return board

def get_board(m,numbers):
 n = m**2
 board = [[None for _ in range(n)] for _ in range(n)]
 for i,j in itertools.product(range(n),repeat=2):
 i0,j0 = i-i%m,j-j%m

 # i,j分别代表的是我们的行和列
 # i0和j0代表的是board[i][j]所在的区块的起始位置

 random.shuffle(numbers)
 #shuffle() 方法将序列的所有元素随机排序。
 for x in numbers:
  if(x not in board[i] 
  and all(row[j]!=x for row in board) 
  and all(x not in row[j0:j0+m] 
  for row in board[i0:i])):
  board[i][j] = x
  break
 else:#当循环正常结束时会执行else
  return None
 return board

def print_board(board,m=3):
 numbers = list(range(1,m**2+1))

 #每一行随机把5个数字变成None
 omit = 5 #omit变量掌控着每一行被抹去的数字个数
 challange = deepcopy(board)
 for i,j in itertools.product(range(omit),range(m**2)):
 x = random.choice(numbers) - 1
 challange[x][j] = None

 spacer = "++-----+-----+-----++-----+-----+-----++-----+-----+-----++"
 print(spacer.replace('-','='))
 for i,line in enumerate(challange):
 print("|| {} | {} | {} || {} | {} | {} || {} | {} | {} ||"
 .format(*(cell or ' ' for cell in line)))

 #format()函数中的 * 号，则是将所有的 cell 的不同值放入一个元组 tuple 之中，方便format函数调用
 if(i+1)%3==0:
  print(spacer.replace('-','='))
 else:
  print(spacer)
 return challange

Board = make_board()
print_board(Board)

package com.jimo;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;

public class Shudu {

 public String[][] make_board(int m) {
 String[][] board = null;
 int n = m * m;
 List<Integer> numbers = new ArrayList<>();
 for (int i = 1; i <= n; i++) {
  numbers.add(i);
 }
 while (board == null) {
  board = get_board(m, numbers);
 }
 return board;
 }

 private String[][] get_board(int m, List<Integer> numbers) {
 int n = m * m;
 String[][] board = new String[n][n];
 for (int i = 0; i < n; i++) {
  for (int j = 0; j < n; j++) {
  boolean ok = true;
  // 打乱顺序
  Collections.shuffle(numbers);
  for (int x = 0; x < n; x++) {
   if (isOk(numbers.get(x) + "", board, i, j, m)) {
   board[i][j] = numbers.get(x) + "";
   ok = false;
   break;
   }
  }
  if (ok) {
   return null;
  }
  }
 }
 return board;
 }

 public void print_board(String[][] board, int m) {
 int n = m * m;
 int hard = 5;
 String[][] b = new String[n][n];
 System.arraycopy(board, 0, b, 0, board.length);
 Random rd = new Random();
 for (int i = 0; i < hard; i++) {
  for (int j = 0; j < n; j++) {
  int x = rd.nextInt(9);
  b[x][j] = null;
  }
 }
 String spacer = "+-----+-----+-----+-----+-----+-----+-----+-----+-----+";
 System.out.println(spacer);
 for (int i = 0; i < n; i++) {
  for (int j = 0; j < n; j++) {
  if (null == board[i][j]) {
   System.out.print("| |");
  } else {
   System.out.print("| " + b[i][j] + " |");
  }
  }
  System.out.println();
  System.out.println(spacer);
 }
 }

 /**
 * 判断行列和9格里是否重复
 * 
 * @param x
 * @param board
 * @return
 */
 private boolean isOk(String x, String[][] board, int i, int j, int m) {
 int i0 = i - i % m, j0 = j - j % m;
 int n = m * m;
 for (int k = 0; k < n; k++) {
  if (x.equals(board[i][k]) || x.equals(board[k][j])) {
  return false;
  }
 }
 for (int k = i0; k < i; k++) {
  for (int g = j0; g < j0 + m; g++) {
  if (board[k][g].equals(x)) {
   return false;
  }
  }
 }
 return true;
 }

 public static void main(String[] args) {
 Shudu s = new Shudu();
 int m = 3;
 String[][] b = s.make_board(m);
 for (int i = 0; i < 9; i++) {
  for (int j = 0; j < 9; j++) {
  System.out.print(b[i][j] + " ");
  }
  System.out.println();
 }
 s.print_board(b, m);
 }
}

3 4 7 6 5 2 8 1 9 
5 9 6 8 3 1 4 2 7 
2 1 8 9 7 4 5 3 6 
1 3 4 7 9 5 6 8 2 
7 5 2 1 8 6 9 4 3 
6 8 9 4 2 3 1 7 5 
4 7 5 3 1 9 2 6 8 
8 2 1 5 6 7 3 9 4 
9 6 3 2 4 8 7 5 1 
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| || || || 6 || 5 || || 8 || 1 || 9 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 5 || 9 || 6 || || || || 4 || || 7 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 2 || || || 9 || 7 || 4 || 5 || || 6 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 1 || 3 || 4 || 7 || 9 || || 6 || || |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| || 5 || 2 || 1 || || || || 4 || |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| || || || || 2 || 3 || || 7 || |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 4 || 7 || || || 1 || 9 || || 6 || 8 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| || 2 || 1 || 5 || 6 || 7 || || || 4 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+
| 9 || 6 || || || || || || 5 || 1 |
+-----+-----+-----+-----+-----+-----+-----+-----+-----+