考生文件夹下存在一个文件PY101.py，请写代码替换横线，不修改其他代码，实现以下功能:
读取考生文件夹下的“poem.txt” 的内容，云除空行和注释行后，以行为单位进行排序，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,
参考答案
f = open("poem.txt","r")
result = []
for line in f:
line = line.strip()
if len(line) != 0 and line[0] != "#":
result.append(line)
result.sort()#排序
for line in result:
print(line)
f.close()
