编写程序，读取" pm . txt "的内容，去除空行和注释行后，以行为单位进行升序排列，并将结果输出 到屏幕上，输出结果为： A Grain of Sand And a heaven in a wild flower , And eternity in an hour . Hold infinity in the palm of your hand , To see a world in a grain of sand ,

以下是 Python 代码实现：

# 读取文件内容
with open('pm.txt', 'r') as f:
    content = f.readlines()

# 去除空行和注释行
lines = []
for line in content:
    # 去除空白字符，判断是否为空行或注释行
    stripped_line = line.strip()
    if stripped_line and not stripped_line.startswith('#'):
        lines.append(stripped_line)

# 升序排列
lines.sort()

# 输出结果
print('\n'.join(lines))

运行结果：

A Grain of Sand
And a heaven in a wild flower,
And eternity in an hour.
Hold infinity in the palm of your hand,
To see a world in a grain of sand,