1）使用while、if循环输入123456 8910
count = 0
while count < 10:
count += 1
if count == 7:
print('')
else:
print(count)
或
count = 0
while count < 10:
count += 1
if count == 7:
continue
print(count)
2)输出 1-100 内的所有奇数
1)
count = 1
while count < 101:
print(count)
count += 1
2)
count = 1
while count < 101:
count % 2 = 1
print(count)
count += 1
3）求1-2+3-4+5 ... 99的所有数的和
sum =
count =
sum =
count =
while count < :
if count % == :
sum = sum - count
else:
sum = sum + count
count +=
print(sum)
4).用户登陆（三次机会重试）
#input 心中有账号，密码 while i = 0
while i < 3:
username = input('请输入账号：')
password = int(input('请输入密码：'))
if username == '咸鱼哥' and password == 123:
print('登录成功')
else:
print('登录失败请重新登录')
i += 1
5).计算 1 - 2 + 3 ... -99 中除了88意外所有数的总和
i = 0 #把减号当成符号来运算，例：-2为一个数字 i更改的只是符号
j = -1 #则 i 为一加一减 sum = i + i *j (sum为i相加）
sum = 0
while i < 99:
i += 1
if 1 = 88:
continue
else:
j = -j
sum = i + i * j
print(sum)