无法在python中的venv中安装加密==3.4.7

Question

我正在尝试在非互联网机器上安装几个 python 包。出现错误为

Could not find a version that satisfies the requirement cryptography==3.4.7 (from -r requirements.txt (line 14)) (from versions: )
No matching distribution found for cryptography==3.4.7 (from -r requirements.txt (line 14))

我下载了在线系统中的所有软件包，并将requirements.txt软件包文件夹移动并下载到离线系统，并尝试使用以下命令在其中安装软件包，

pip3.6 install --no-index --find-links="./tranferred_packages" -r requirements.txt

我遵循的步骤 -

1. virtualenv使用pip在线安装：

pip install virtualenv --user

2. 创建virtualenv并获取它的来源

python -m virtualenv myenv
cd myenv 
source bin/activate

3. 使用安装的包

pip3 install pkgname

4. 然后做了

pip freeze > requirements.txt

5. 使用以下命令将 pkgs 下载到一个文件夹

pip download -r requirements.txt

6. 将 pkgs 文件夹移动requirements.txt并下载到离线系统并尝试使用安装 pkgs 在那里

pip install --no-index --find-links="./tranferred_packages" -r requirements.txt

详细错误是

Collecting cryptography==3.4.7 (from -r requirements.txt (line 14))
  0 location(s) to search for versions of cryptography:
  Could not find a version that satisfies the requirement cryptography==3.4.7 (from -r requirements.txt (line 14)) (from versions: )
Cleaning up...
  Removing source in /tmp/pip-build-beg7uvpz/aws-requests-auth
  Removing source in /tmp/pip-build-beg7uvpz/blist
  Removing source in /tmp/pip-build-beg7uvpz/chardet2
No matching distribution found for cryptography==3.4.7 (from -r requirements.txt (line 14))
Exception information:
Traceback (most recent call last):
  File "/root/venv/lib64/python3.6/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/root/venv/lib64/python3.6/site-packages/pip/commands/install.py", line 346, in run
    requirement_set.prepare_files(finder)
  File "/root/venv/lib64/python3.6/site-packages/pip/req/req_set.py", line 381, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/root/venv/lib64/python3.6/site-packages/pip/req/req_set.py", line 557, in _prepare_file
    require_hashes
  File "/root/venv/lib64/python3.6/site-packages/pip/req/req_install.py", line 278, in populate_link
    self.link = finder.find_requirement(self, upgrade)
  File "/root/venv/lib64/python3.6/site-packages/pip/index.py", line 514, in find_requirement
    'No matching distribution found for %s' % req
pip.exceptions.DistributionNotFound: No matching distribution found for cryptography==3.4.7 (from -r requirements.txt (line 14))

我已经在文件夹中cryptography提到requirements.txt并cryptography-3.4.7-cp36-abi3-manylinux2014_x86_64.whl存在tranferred_packages。

cat requirements.txt | grep cryptography
cryptography==3.4.7

(venv) [root@ip-172-35-10-19 venv]# ls -l tranferred_packages/cryptography-3.4.7-cp36-abi3-manylinux2014_x86_64.whl 
-rwxr-xr-x. 1 root root 3181242 Apr 27 15:05 tranferred_packages/cryptography-3.4.7-cp36-abi3-manylinux2014_x86_64.whl
(venv) [root@ip-172-35-10-19 venv]# 

其他包的输出没有给出错误，

Collecting certifi==2020.4.5.1 (from -r requirements.txt (line 7))
  0 location(s) to search for versions of certifi:
  Found link file:///root/venv/tranferred_packages/certifi-2020.4.5.1-py2.py3-none-any.whl, version: 2020.4.5.1
  Local files found: /root/venv/tranferred_packages/certifi-2020.4.5.1-py2.py3-none-any.whl
  Using version 2020.4.5.1 (newest of versions: 2020.4.5.1)

我可以在创建时安装相同的内容virtualenv，但在创建时不能安装venv。

使用以下命令创建virtualenv ，

pip3 install virtualenv --user

输出pip3 list

# pip3 list |grep cryptography
cryptography          3.4.7

在这个 virtualenv 中，python 和 pip 版本是，

python                    python2.7                 python3.6                 python3.6m                python3.6m-x86_64-config  
python2                   python3                   python3.6-config          python3.6m-config         python3-config       

# python -V
Python 3.6.8

# python3.6 -V
Python 3.6.8

pip      pip3     pip-3    pip-3.6  pip3.6

# pip-3.6  -V
pip 21.0.1 from /root/oldenv/lib/python3.6/site-packages/pip (python 3.6)

以上所有 pip 显示版本为，pip 21.0.1除了pip-3其中显示版本为，

pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)

创建 virtualenv 后默认安装了以下三个模块

pip 21.0.1
setuptools 56.0.0
wheel 0.34.2

---

使用以下命令创建venv ，

# python3.6 -m venv devenv 

创建venv后默认安装以下两个模块，

pip (9.0.3)
setuptools (39.2.0)

系统范围的 python 和 pip 版本

python                    python2.7                 python3.6                 python3.6m                python3.6m-x86_64-config  
python2                   python3                   python3.6-config          python3.6m-config         python3-config 

# python --version
Python 2.7.5

# python3.6 --version
Python 3.6.8


pip3     pip-3    pip-3.6  pip3.6

# pip3.6  -V
pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)

其他详情 -

RHEL 7.8（麦坡）
内核 - 3.10.0-1127.el7.x86_64

有人能说出是什么导致了问题吗？

谢谢，

Answer 1

pip-9.0.3使用命令从pip-21.1(pip-21.1-py3-none-any.whl)升级后问题得到解决python3 -m pip install --upgrade pip-21.1-py3-none-any.whl。