1、使用while循环输出1 2 3 4 5 6 8 9 10
count=0 while count<10: count+=1 if count==7: continue print(count,end=' ') 2、求1-100的所有数的和
count=0 sum=0 while count < 100: count+=1 sum+=count print(sum) 3、输出 1-100 内的所有奇数
count=0 while count<100: count += 1 if count%2 > 0: print(count) 4、输出 1-100 内的所有偶数
count=0 while count<100: count+= 2 print(count) 5、求1-2+3-4+5 ... 99的所有数的和 count=0 sum=0 while count <99: count += 1 if count%2>0: sum+=count else: sum-=count print(sum)
6、用户登陆（三次机会重试）
n=3 while n>0: user = input('Please enter your username:') password = input('Please enter your password:') if user=="123" and password=="456": print('Login Successful') break else : n-=1 print('用户名或密码错误，还可重试%s次。' %n)