python代码小题（4）

#输出等腰三角形

i = 1
while i <= 5:
    print(" "*(5-i),end = "")
    j = 1
    while j <= 2*i-1:
        print("*",end = "")
        j += 1
    print("")
    i += 1

#for循环输出9*9乘法表

for j in range(1,10):
    for i in range(1,j+1):
        print(f"{i}*{j}={i*j}",end = "\t")
    print(" ")

#用户登录系统与检验

num = 0
for i in range(3):
    num += 1
    username = input("请输入用户名：")
    password = input("请输入密码：")
    if username =="admin":
        if password == "888":
            print("登陆成功")
            break
        else:
            print("密码错误")
            print(f"你还有{3-num}次机会")
    else:
        print("用户名错误")
        print(f"你还有{3-num}次机会")
else :
    print("系统锁定")

#for循环输出素数

for i in range(1,101):
    for j in range(2,i+1):
        if i%j == 0:
            if j == i:
                print(i)
            else :
                break