python 中如何删除空行

001、

(base) root@PC1:/home/test3# ls
a.txt  test.py
(base) root@PC1:/home/test3# cat a.txt        ## 测试数据
ddd ff ff

jkj jj

dffffffgg

dgfggggg
(base) root@PC1:/home/test3# cat test.py     ## 测试脚本
#!/usr/bin/python
in_file = open("a.txt", "r")
out_file = open("result.txt", "w")

for i in in_file:
    if i.isspace():
        continue
    else:
        out_file.write(i)

in_file.close()
out_file.close()
(base) root@PC1:/home/test3# python test.py    ## 运行程序
(base) root@PC1:/home/test3# ls
a.txt  result.txt  test.py
(base) root@PC1:/home/test3# cat result.txt    ## 程序结果
ddd ff ff
jkj jj
dffffffgg
dgfggggg