Python错误不能导入名称certificate_transparency

Question

试图运行pymodbus tcp服务器并获取堆栈跟踪.完全失去了这里，所以任何帮助都是非常感谢的。谢谢!

Traceback (most recent call last):
File "Worrking_ModbusJ1939Bridge.py", line 12, in <module>
from pymodbus.server.async import StartTcpServer
File "build/bdist.linux-armv7l/egg/pymodbus/server/async.py", line 18, in <module>
File "build/bdist.linux-armv7l/egg/pymodbus/internal/ptwisted.py", line 5, in <module>
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 18, 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 345, in <module>
class SSHTransportBase(protocol.Protocol):
File "/usr/local/lib/python2.7/dist-packages/twisted/conch/ssh/transport.py", line 469, in SSHTransportBase
supportedCiphers = _getSupportedCiphers()
File "/usr/local/lib/python2.7/dist-packages/twisted/conch/ssh/transport.py", line 335, in _getSupportedCiphers
backend=default_backend(),
File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/__init__.py", line 15, in default_backend
from cryptography.hazmat.backends.openssl.backend import backend
File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/__init__.py", line 7, in <module>
from cryptography.hazmat.backends.openssl.backend import backend
File "/usr/local/lib/python2.7/dist-packages/cryptography/hazmat/backends/openssl/backend.py", line 16, in <module>
from cryptography import utils, x509
File "/usr/local/lib/python2.7/dist-packages/cryptography/x509/__init__.py", line 7, in <module>
from cryptography.x509 import certificate_transparency
ImportError: cannot import name certificate_transparency

Answer 1

我在使用pip 7，也遇到了同样的问题。升级到pip 9解决了这个问题。我不确定原因。

Via：https://github.com/micheloosterhof/cowrie/issues/618

Answer 2

在尝试使用https://github.com/oracle/solaris-userland/构建系统更新Solaris 11.4的Python时，我一直在尝试这样做。对我来说，对pip的“简单”更新不是一种选择，我们不是这样做的。

我最终想出了解决方案:我错误地构建了这个包。

密码学2.1.4依赖于cffi > 1.7。与我们交付的版本相比，这两个包都有新的可交付比特。

未能更新包清单以正确跟踪新文件，将导致cffi和密码学无法导入当前版本所依赖的符号。

非常感谢#密码学中的亚历克斯·盖诺，他让我走上了正确的道路。

$ python2.7   
Python 2.7.14 (default, Jan 31 2018, 05:35:05) [C] on sunos5
Type "help", "copyright", "credits" or "license" for more information.
>>> from cryptography.hazmat.bindings._openssl import ffi, lib
>>> from cryptography.x509 import certificate_transparency
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/vendor-packages/cryptography/x509/__init__.py", line 7, in <module>
    from cryptography.x509 import certificate_transparency
ImportError: cannot import name certificate_transparency

如果您构建了密码学并查看它提供了什么，您会发现实际上有一个文件( Solaris作为/usr/lib/python-$(PYVER)/vendor-packages/cryptography/x509/certificate_transparency.py提供)-如果该文件不在层次结构的其他部分，那么您最终得到的正是这个ImportError。

Answer 3

它对我有用(paramiko的问题)：

https://pypi.python.org/pypi/ctutlz/0.7.0

pip安装-进程依赖-链接ctutlz