以菱形格式打印单词

def print_diamond(word):
    n = len(word)
    for i in range(n):
        # 打印上半部分菱形
        print(" " * (n-i-1) + word[:i+1])
    for i in range(n-2, -1, -1):
        # 打印下半部分菱形
        print(" " * (n-i-1) + word[:i+1])

# 示例调用
print_diamond("HELLO")

   H
  HE
 HEL
HELL
 HEL
  HE
   H