Python之while循环

一.while循环总规则

1 while 条件:
2     循环体

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二.无限循环

1 while 条件:
2     无限循环

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1 while True:
2     print('我爱china')

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三.循环输出1-100 改变条件跳出循环

1 count = 1
2 flag = True
3 # 标志位方便之后对变量的修改
4 while flag:
5     print(count)
6     count = count + 1
7     # count += 1
8     if count >= 101:
9         flag = False

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1 count = 1
2 while count <= 100:
3     print(count)
4     count = count + 1
5     # count += 1

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3.1输出1+2+3+4+...+100的和

1 count = 1
2 sum1 = 0
3 while count <= 100:
4     sum1 = sum1 + count
5     count = count + 1
6 print(sum1)

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利用break实现

1 count = 1
2 sum1 = 0
3 while True:
4     sum1 += count
5     count += 1
6     if count > 100:
7         break
8 print(sum1)

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当然实现方式一大堆更新中........................

3.2关键字break、continue

　break:终止循环使其条件不成立　

　continue:结束本次循环，进行下一次循环　

1 # break
2 print(11)
3 while True:
4     print(1111)
5     print(123)
6     break
7     print(78945)
8 print(12345678)

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1 print(111)
2 count = 1
3 while count <= 20:
4     print(count)
5     continue
6     count += 1
7     # 输出全是1,相当于死循环了

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