一、使用while循环输入1-10，其中不包括7
1 number = 0
2 while number<10:
3 number +=1
4 if number == 7:
5 continue
6 print(number)
二、求1-100的所有数的和
1 count = 1
2 sum = 0
3 flag =True
4 while flag:
5 sum = sum + count
6 count += 1
7 if count > 100:
8 break
9 print('1-100的总和是：',sum)
三、输出1-100内的所有奇数
1 odd = 1
2 while odd <=100:
3 print(odd)
4 odd += 2
四、输出1-100内的所有偶数
1 even = 0
2 while even <=100:
3 even += 2
4 if even > 100:
5 continue
6 print(even)
五、求1-2+3-4+5...99的所有数的和
1 odd = 1
2 even = 2
3 odd_sum = 0
4 even_sum = 0
5 while odd < 100:
6 odd_sum = odd_sum + odd
7 odd += 2
8 while even < 100:
9 even_sum = even_sum + even
10 even += 2
11 print('odd_sum:',odd_sum,'even_sum:',even_sum)
12 count_sum = odd_sum - even_sum
13 print("1-2+3-4+5...99的所有数的和是:",count_sum)
六、用户登陆（三次机会重试）
count_number = 3
name = 'admin'
password = 'admin'
flag = True
while flag:
user_name = input("请输入你的用户名:")
user_password = input("请输入你的登录密码:")
if user_name==name and user_password==password:
print('用户名与登录密码输入正确，用户登录成功')
break
if count_number == 3:
print('用户名或登录密码输入不一致，你还有两次机会')
elif count_number == 2:
print('用户名或登录密码输入不一致，你还有一次机会')
else:
print('用户名或登录密码输入不一致，你的机会已经用完，请过5分钟后再试')
count_number -= 1
if count_number < 1:
break