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我是python的新手。在rasperry pi上安裝加密3
我模擬通過Modbus服務器和客戶機之間的連接。我用pymodbus庫做到這一點。
我的服務器是一個異步服務器，我知道這對樹莓安裝加密，使其工作是必要的。
我發現這些指示，我跟着：
-sudo apt-get的安裝建立必要的libssl-dev的libffi-dev的蟒蛇-dev的;
-sudo pip install cryptography;
在那之後，我有一個錯誤：
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
我嘗試相同的代碼蟒蛇到Eclipse Windows計算機上，它的工作原理。
我該如何解決這個問題？