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machinelearning_notebook/homework_01_python/01_05.py

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  1. #1.5 使用while循环实现输出2-3+4-5+6.....+100的和

  2. 

  3. #方法1

  4. i = 2

  5. sum1 = 0

  6. while i <= 100:

  7.     sum1 += (-1)**i * i

  8.     i += 1

  9. 

  10. #方法2

  11. sum2 = 0

  12. for j in range(2,101):sum2 += (-1)**j * j

  13. 

  14. print(sum1,sum2)