In [2]:

    

#练习2
i = 0
n = 0
name = input('请输入你的姓名，以回车结束。')
print('你好', name)
num = int(input('请输入你想求和的整数的个数'))
for i in range(num):
    k = int(input())
    n += k
print('这些数的和是：', n)
print('再见！', name)

#练习3
import sys
i = 0
a = dict()
print("您可以输入“不想输入”来结束程序")
while True:
    a[i] = input()
    if a[i] == '不想输入':
        sys.exit(0)
    i += 1

#练习4
import sys
sum_1 = 0
sum_2 = 1
while True:
    n = input()
    n = int(n)
    if (sum_1 < n) and (sum_2 < (n**2)) :
        sys.exit(0)
    sum_1 += n
    sum_2 *= n


    

    




1
1
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1
1
1
1
1
1
1
1
11
1
10000000000000






    




An exception has occurred, use %tb to see the full traceback.

SystemExit: 0






    




C:\ProgramData\Anaconda3\lib\site-packages\IPython\core\interactiveshell.py:2889: UserWarning: To exit: use 'exit', 'quit', or Ctrl-D.
  warn("To exit: use 'exit', 'quit', or Ctrl-D.", stacklevel=1)