python基础一
1.使用while输出1 2 3 4 5 6 ... 10
count = 1 while count <=10 : if count == 7: print(" ") else:print(count) count +=1
2.求1-100的和
count =1 sum = 0 while count <=100 : sum += count count+=1 print(sum)
3.输出1-100的所有奇数
num=1 while num<=100 : if num%2!=0 : print(num) num+=1
4.求1-2+3-4...99的所有数之和
num = 1 sum = 0 flag=1 while num <= 99: sum+=num*flag flag=flag * -1 num+=1 print(sum)
5.用户登录(三次重试机会)假设密码账户均为admin
count = 3 while True : user = input("请输入账号") password = input("请输入密码") if user == "admin" and password == "admin" : print("登录成功") break else: count -= 1 if count!=0: print("你还有", count, "次机会") else: print("登录失败") break