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我是python的新手。在rasperry pi上安装加密3
我模拟通过Modbus服务器和客户机之间的连接。我用pymodbus库做到这一点。
我的服务器是一个异步服务器，我知道这对树莓安装加密，使其工作是必要的。
我发现这些指示，我跟着：
-sudo apt-get的安装建立必要的libssl-dev的libffi-dev的蟒蛇-dev的;
-sudo pip install cryptography;
在那之后，我有一个错误：
Traceback (most recent call last):
File "modbus_server.py", line 4, in <module>
from pymodbus.server.async import StartTcpServer
File "/usr/local/lib/python2.7/dist-packages/pymodbus/server/async.py", line 18, in <module>
from pymodbus.internal.ptwisted import InstallManagementConsole
File "/usr/local/lib/python2.7/dist-packages/pymodbus/internal/ptwisted.py", line 5, in <module>
from twisted.conch import manhole, manhole_ssh
File "/usr/local/lib/python2.7/dist-packages/twisted/conch/manhole_ssh.py", line 14, in <module>
from twisted.conch.ssh import factory, session
File "/usr/local/lib/python2.7/dist-packages/twisted/conch/ssh/factory.py", line 17, in <module>
from twisted.conch.ssh import (_kex, transport, userauth, connection)
File "/usr/local/lib/python2.7/dist-packages/twisted/conch/ssh/transport.py", line 23, in <module>
from cryptography.hazmat.backends import default_backend
File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/__init__.py", line 7, in <module>
import pkg_resources
File "/usr/local/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 70, in <module>
import packaging.version
ImportError: No module named packaging.version
我尝试相同的代码蟒蛇到Eclipse Windows计算机上，它的工作原理。
我该如何解决这个问题？