python + 升级密码学 pkg 后没有名为 cryptography.fernet 的模块

Question

we update some python pkgs and modules

one of them was the pkg cryptography

we update the cryptography from version cryptography (1.7.1) to cryptography (2.9.2)

but when we access the python shell, we get ImportError: No module named cryptography.fernet

in spite cryptography is installed

pip list |grep  cryptography
cryptography (2.9.2)

from python shell

python
Python 2.7.5 (default, Sep 12 2018, 05:31:16)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from cryptography.fernet import Fernet
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named cryptography.fernet

Note - on the previous version cryptography (1.7.1) , every thing was ok

so what could be the problem with the module?

note the same problem is from the python script

import sys
import os
import base64
from cryptography.fernet import Fernet
.
.
.

Answer 1

installing of the following rpm file solved the problem

yum localinstall python2-cryptography-1.7.2-2.el7.x86_64.rpm
Loaded plugins: langpacks
Configuration
Examining python2-cryptography-1.7.2-2.el7.x86_64.rpm: python2-cryptography-1.7.2-2.el7.x86_64
Marking python2-cryptography-1.7.2-2.el7.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package python2-cryptography.x86_64 0:1.7.2-2.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================
 Package                                       Arch                            Version                               Repository                                                         Size
=============================================================================================================================================================================================
Installing:
 python2-cryptography                          x86_64                          1.7.2-2.el7                           /python2-cryptography-1.7.2-2.el7.x86_64                          2.6 M

Transaction Summary
=============================================================================================================================================================================================
Install  1 Package

Total size: 2.6 M
Installed size: 2.6 M
Is this ok [y/d/N]: n
Exiting on user command
Your transaction was saved, rerun it with:
 yum load-transaction /tmp/yum_save_tx.2020-06-04.09-55.SDc8o9.yumtx
[root@master02 TEST1]# yum localinstall python2-cryptography-1.7.2-2.el7.x86_64.rpm
Loaded plugins: langpacks
Repository HDP-2.6-repo-1 is listed more than once in the configuration
Repository HDP-UTILS-1.1.0.22-repo-1 is listed more than once in the configuration
Examining python2-cryptography-1.7.2-2.el7.x86_64.rpm: python2-cryptography-1.7.2-2.el7.x86_64
Marking python2-cryptography-1.7.2-2.el7.x86_64.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package python2-cryptography.x86_64 0:1.7.2-2.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================
 Package                                       Arch                            Version                               Repository                                                         Size
=============================================================================================================================================================================================
Installing:
 python2-cryptography                          x86_64                          1.7.2-2.el7                           /python2-cryptography-1.7.2-2.el7.x86_64                          2.6 M

Transaction Summary
=============================================================================================================================================================================================
Install  1 Package

Total size: 2.6 M
Installed size: 2.6 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : python2-cryptography-1.7.2-2.el7.x86_64                                                                                                                                   1/1
  Verifying  : python2-cryptography-1.7.2-2.el7.x86_64                                                                                                                                   1/1

Installed:
  python2-cryptography.x86_64 0:1.7.2-2.el7

Complete!