python第一天练习

# 1、使用while循环输入 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 = 1
sum_1 = 0
while count <= 100:  
    sum_1 += count
    count += 1
print(sum_1)


# 3、输出 1-100 内的所有奇数
count = 1
while count < 101:
    if count % 2 == 1:
        print(count,end='|')
    count += 1


# 4、输出 1-100 内的所有偶数
count = 1
while count < 101:
    if count % 2 == 0:
        print(count,end='|')
    count += 1



# 5、求1-2+3-4+5 ... 99的所有数的和
count = 0
sum_1 = 0
while count < 100:

    if count % 2 == 0:
        sum_1 -= count
    else :
        sum_1 += count
    count += 1
print(sum_1)

# 6、用户登陆（三次机会重试）
USER_NAME = 'root'
PASSWORD = 'rootroot'
count = 3
while count > 0 and count < 4:
    user_name = input("请输入用户名")
    password = input("请输入密码")
    if user_name == USER_NAME and password == PASSWORD:
        print("登陆成功")
        break
    else:
        count -= 1
        if count != 0 :
           print("输入错误您还有" + str(count) + "次机会")
else :
    print("今天的次数已经用光")