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machinelearning_notebook/homework_01_python/01_02.py

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  1. #1.2 组合：有 1、2、3、4 个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？

  2. 

  3. #数字源

  4. num_list = [1,2,3,4]

  5. #不重复三位数列表

  6. three_digit_list = []

  7. for i in range(len(num_list)):

  8.     for j in range(len(num_list)):

  9.         for k in range(len(num_list)):

  10.             #生成三位数

  11.             three_digit = 100*num_list[i] + 10*num_list[j] + 1*num_list[k]

  12.             # 更新三位数列表

  13.             if three_digit not in three_digit_list:

  14.                 three_digit_list.append(three_digit)

  15. print(three_digit_list)