python-while循环，for ,以及字符串格式化

1.字符串格式化

name="suwukong"

print("欢迎",name,"光临")
print("欢迎 "+name+" 光临")
print("欢迎 %s 光临" %name)
print(f"欢迎 {name} 光临")

2.用while 打印三角形

i =
while i<=:
    j=
    while j<=i:
        print("*",end="")
        j=j+
    print("")
    i=i+

2.九九乘法表

a =
while a <= :
    b =
    while b <= a:
        print("%s * %s = %s\t "%(b,a,a*b),end="")
        b = b +
    print("")
    a = a + 

3.打印矩形

j =
while j<=:
    k=
    while k<=:
        print("*",end="")
        k=k+
    print("")
    j=j+