python练习题-day1

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)

2.求1-100所有数的和

sum=0
for i in range(101):
    sum+=i
print(sum)

3.输出1-100内的所有奇数

li=[]
for i in range(1,101):
    if i%2==1:
        li.append(i)
print(li)

4.输出1-100内的所有偶数

li=[]
for i in range(1,101):
    if i%2==0:
        li.append(i)
print(li)

5.求1-2+3-4+5 ... 99的所有数的和

sum=0
for i in range(100):
    if i %2 ==0:
        sum-=i
    if i%2==1:
        sum+=i
print(sum)

#方法2
sum=0
j=1
for i in range(1,100):
    sum+=i*j
    j=-j
print(sum)

6.用户登录，三次机会重试

count=0
while True:
    uname="myfu"
    password="123"
    u,p=input("input your name and password:").split()
    count+=1
    if uname ==u and password ==p:
        exit("login success")
    else:
        if count==3:
            exit("three times error input,your count is locked")
        else:
            print("error username or password ,pls try again,%s time last"%(3-count))