代码一：使用字符串拼接绘制圣诞树
```python
def draw_christmas_tree(height):
"""绘制圣诞树
参数:
height: 圣诞树的高度(即树的层数)
"""
绘制圣诞树的顶部星星
print("" * (height - 1) + "*" * 1)
绘制圣诞树的主体部分
for i in range(1, height + 1):
print("" * (height - i) + "*" * (2 * i - 1))
绘制圣诞树的树干
for _ in range(2):
print("" * (height - 1) + "|" * 1)
输出节日祝福语
print("\n