fail 命令在 os.popen 中是不能执行的？

[aias]

import os
os.popen("tail -f /root/projects/***/***/logs/application.log")
<open file 'tail -f /root/projects/***/***/logs/application.log', mode 'r' at 0x7f36bd7c9390>

[aias]

os.popen("tail -f /root/projects/***/***/logs/application.log"，“ r ”)直接没反应了..

[aias]

还是不行..

[binux]

In [1]: import os

In [2]: f = os.popen("tail -f ./domains.txt")

In [3]: f.readline()
Out[3]: 'www.thephonebook.bt.com\n'

In [4]: f.read(10)
Out[4]: 'www.chambe'

In [5]: f.readline()
Out[5]: 'rofcommerce.com\n'

[aias]

@binux 感谢