从键盘输入一个数，请利用循环输出对应行数的图形

这道题比较广泛，不确定是要求什么样的图形。以下是几种可能的解法：

1. 输出等腰三角形

num = int(input("请输入一个数："))

for i in range(num):
    for j in range(num-i-1):
        print(end=" ")
    for j in range(2*i+1):
        print("*", end="")
    print()

2. 输出矩形

num = int(input("请输入一个数："))

for i in range(num):
    for j in range(num):
        print("*", end="")
    print()

3. 输出菱形

num = int(input("请输入一个数："))

for i in range(num):
    for j in range(num-i-1):
        print(end=" ")
    for j in range(2*i+1):
        print("*", end="")
    print()

for i in range(num-1, 0, -1):
    for j in range(num-i):
        print(end=" ")
    for j in range(2*i-1):
        print("*", end="")
    print()

4. 输出倒三角形

num = int(input("请输入一个数："))

for i in range(num):
    for j in range(i+1):
        print("*", end="")
    print()

for i in range(num-1):
    for j in range(num-i-1):
        print("*", end="")
    print()