Python之while循环

一.while循环总规则

while 条件:
    循环体

二.无限循环

while 条件:
    无限循环

while True:
    print('我爱china')

三.循环输出1-100  改变条件跳出循环

count = 1
flag = True
# 标志位方便之后对变量的修改
while flag:
    print(count)
    count = count + 1
    # count += 1
    if count >= 101:
        flag = False

count = 1
while count <= 100:
    print(count)
    count = count + 1
    # count += 1

  3.1输出1+2+3+4+...+100的和

count = 1
sum1 = 0
while count <= 100:
    sum1 = sum1 + count
    count = count + 1
print(sum1)

---

 利用break实现

count = 1
sum1 = 0
while True:
    sum1 += count
    count += 1
    if count > 100:
        break
print(sum1)

   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　

# break
print(11)
while True:
    print(1111)
    print(123)
    break
    print(78945)
print(12345678)

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