遇到的python3不兼容python2的地方

>>> import subprocess
>>> p=subprocess.Popen('ls',shell=True,stdout=subprocess.PIPE) 
>>> d=p.stdout.read()
>>> d
b'agent2.0.tgz\njdk1.8.0_152\njdk-8u152-linux-x64.tar.gz\nmha4mysql-manager-0.56-0.el6.noarch.rpm\nmha4mysql-node-0.56-0.el6.noarch.rpm\nscript.rpm.sh\nscripts\n'
>>> d.split('\n')
Traceback (most recent call last):
  File "", line 1, in 
TypeError: 'str' does not support the buffer interface

>>> p=subprocess.Popen('ls',shell=True,stdout=subprocess.PIPE)
>>> d=p.stdout.read()
>>> d.split(bytes('\n','utf8'))
[b'agent2.0.tgz', b'jdk1.8.0_152', b'jdk-8u152-linux-x64.tar.gz', b'mha4mysql-manager-0.56-0.el6.noarch.rpm', b'mha4mysql-node-0.56-0.el6.noarch.rpm', b'script.rpm.sh', b'scripts', b'']