打印具有自定义行、列和长度的重复菱形形状

def print_diamond(rows, cols, length):
    if rows <= 0 or cols <= 0 or length < 0:
        print("输入不合法！")
        return
    
    for i in range(rows):
        for j in range(cols):
            if i <= rows // 2:
                if j >= rows // 2 - i and j <= rows // 2 + i:
                    print("*", end="")
                else:
                    print(" ", end="")
            else:
                if j >= i - rows // 2 and j <= cols - 1 - (i - rows // 2):
                    print("*", end="")
                else:
                    print(" ", end="")
        print()

print_diamond(5, 9, 3)

   *   
  ***  
 ***** 
  ***  
   *