在Pycharm上尝试安装opencv进行双目视觉学习时，用户遇到了pip更新问题和opencv安装失败的问题。pip更新过程中因网络速度慢导致中断，尝试通过清华源升级pip和卸载重装setuptools未成功。在安装opencv及其依赖时，numpy的导入出现问题，提示DLL加载失败。用户已参考相关教程和博客进行操作，但问题仍未解决。
问题背景：
想在Pycharm上安装opencv进行双目视觉学习，出现了一系列问题。
具体问题：
1.pip无法更新到最新版本
ValueError: Unable to find resource t64.exe in package pip._vendor.distlib
WARNING: You are using pip version 21.2.2; however, version 23.0.1 is available.
You should consider upgrading via the 'd:\python39\python.exe -m pip install --upgrade pip' command.
问题分析：
由于很久没有更新pip或者原因可能是由于要连接外网进行下载速度慢，导致更新中途网速较慢，于是报错停止了。
解决方法：
1.如果是很久没有更新pip，可能出现一下情况：
(paddle2) D:\github\PGL>python.exe -m pip install --upgrade pip
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting pip
Using cached https://pypi.tuna.tsinghua.edu.cn/packages/cb/28/91f26bd088ce8e22169032100d4260614fc3da435025ff389ef1d396a433/pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.2.3
Uninstalling pip-20.2.3:
Successfully uninstalled pip-20.2.3
Rolling back uninstall of pip
Moving to c:\users\administrator\appdata\roaming\python\python37\scripts\
from c:\users\administrator\appdata\roaming\python\python37\~cripts
Moving to c:\users\administrator\appdata\roaming\python\python37\site-packages\pip-20.2.3.dist-info\
from c:\users\administrator\appdata\roaming\python\python37\site-packages\~ip-20.2.3.dist-info
Moving to c:\users\administrator\appdata\roaming\python\python37\site-packages\pip\
from c:\users\administrator\appdata\roaming\python\python37\site-packages\~ip
ERROR: Exception:
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\cli\base_command.py", line 228, in _main
status = self.run(options, args)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\cli\req_command.py", line 182, in wrapper
return func(self, options, args)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\commands\install.py", line 406, in run
pycompile=options.compile,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\req\__init__.py", line 90, in install_given_reqs
pycompile=pycompile,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\req\req_install.py", line 822, in install
requested=self.user_supplied,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 860, in install_wheel
requested=requested,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 762, in _install_wheel
generated_console_scripts = maker.make_multiple(scripts_to_generate)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 418, in make_multiple
filenames.extend(self.make(specification, options))
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 498, in make
return super(PipScriptMaker, self).make(specification, options)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 407, in make
self._make_script(entry, filenames, options=options)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 307, in _make_script
self._write_script(scriptnames, shebang, script, filenames, ext)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 242, in _write_script
launcher = self._get_launcher('t')
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 386, in _get_launcher
raise ValueError(msg)
ValueError: Unable to find resource t64.exe in package pip._vendor.distlib
WARNING: You are using pip version 20.2.3; however, version 20.2.4 is available.
You should consider upgrading via the 'd:\Miniconda3\envs\paddle2\python.exe -m pip install --upgrade pip' command.
这个时候参考博客：
https://blog.youkuaiyun.com/weixin_41450123/article/details/110244117
两步走，第一步卸载卸载 setuptools
d:\python39\python.exe -m pip uninstall pip setuptools
(paddle2) D:\github\PGL> d:\python39\python.exe -m pip uninstall pip setuptools
Found existing installation: pip 20.2.3
Uninstalling pip-20.2.3:
Would remove:
c:\users\administrator\appdata\roaming\python\python37\scripts\pip.exe
c:\users\administrator\appdata\roaming\python\python37\scripts\pip3.7.exe
c:\users\administrator\appdata\roaming\python\python37\scripts\pip3.exe
c:\users\administrator\appdata\roaming\python\python37\site-packages\pip-20.2.3.dist-info*
c:\users\administrator\appdata\roaming\python\python37\site-packages\pip*
Proceed (y/n)? y
Successfully uninstalled pip-20.2.3
Found existing installation: setuptools 50.3.0.post20201006
Uninstalling setuptools-50.3.0.post20201006:
Would remove:
d:\miniconda3\envs\paddle2\lib\site-packages_distutils_hack
d:\miniconda3\envs\paddle2\lib\site-packages\easy_install.py
d:\miniconda3\envs\paddle2\lib\site-packages\pkg_resources
d:\miniconda3\envs\paddle2\lib\site-packages\setuptools
d:\miniconda3\envs\paddle2\lib\site-packages\setuptools-50.3.0.post20201006-py3.7.egg-info
d:\miniconda3\envs\paddle2\scripts\easy_install-script.py
d:\miniconda3\envs\paddle2\scripts\easy_install.exe
Proceed (y/n)? y
Successfully uninstalled setuptools-50.3.0.post20201006
第二步，升级pip
pip3 install --upgrade pip
==2.如果是因为使用的国外镜像源，导致下载速度比较慢，最后报错停止下载：
ValueError: Unable to find resource t64.exe in package pip._vendor.distlib
WARNING: You are using pip version 21.2.2; however, version 23.0.1 is available.
You should consider upgrading via the 'd:\python39\python.exe -m pip install --upgrade pip' command.
这个时候考虑使用清华源：
https://mirrors.tuna.tsinghua.edu.cn/help/pypi/
使用镜像源下载pip
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package
升级pip
d:\python39\python.exe -m pip install --upgrade pip
如果还是不行，考虑上面的第一步卸载卸载 setuptools
d:\python39\python.exe -m pip uninstall pip setuptools
第二步，升级pip
pip3 install --upgrade pip
2.无法安装opencv(下载到一半，又不能下载报错了)
解决方法：
这里参考视频教程：
https://www.bilibili.com/video/BV1TR4y1e7Ke/?spm_id_from=333.788.recommend_more_video.0&vd_source=258d2d263c2bb92125c92f82857bcfa5
第一步，首先配置镜像源
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
第二步，安装opencv
pip install opencv-python
第三步，下载拓展包
pip install opencv-contrib-python==4.7.0.72
第四步，安装可视化包：
pip install matplotlib
第五步，检验一下是否真的成功安装：
d:\python39\python.exe
import cv2
出现了问题:
>>> import cv2
OpenCV bindings requires "numpy" package.
Install it via command:
pip install numpy
Traceback (most recent call last):
File "d:\python39\lib\site-packages\numpy\core\__init__.py", line 23, in <module>
from . import multiarray
File "d:\python39\lib\site-packages\numpy\core\multiarray.py", line 10, in <module>
from . import overrides
File "d:\python39\lib\site-packages\numpy\core\overrides.py", line 6, in <module>
from numpy.core._multiarray_umath import (
ImportError: DLL load failed while importing _multiarray_umath: 找不到指定的程序。
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "d:\python39\lib\site-packages\cv2\__init__.py", line 11, in <module>
import numpy
File "d:\python39\lib\site-packages\numpy\__init__.py", line 141, in <module>
from . import core
File "d:\python39\lib\site-packages\numpy\core\__init__.py", line 49, in <module>
raise ImportError(msg)
ImportError:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the numpy C-extensions failed. This error can happen for
many reasons, often due to issues with your setup or how NumPy was
installed.
We have compiled some common reasons and troubleshooting tips at:
https://numpy.org/devdocs/user/troubleshooting-importerror.html
Please note and check the following:
* The Python version is: Python3.9 from "d:\python39\python.exe"
* The NumPy version is: "1.24.2"
and make sure that they are the versions you expect.
Please carefully study the documentation linked above for further help.
Original error was: DLL load failed while importing _multiarray_umath: 找不到指定的程序。
>>> import cv2
OpenCV bindings requires "numpy" package.
Install it via command:
pip install numpy
Traceback (most recent call last):
File "d:\python39\lib\site-packages\numpy\core\__init__.py", line 23, in <module>
from . import multiarray
File "d:\python39\lib\site-packages\numpy\core\multiarray.py", line 10, in <module>
from . import overrides
File "d:\python39\lib\site-packages\numpy\core\overrides.py", line 6, in <module>
from numpy.core._multiarray_umath import (
ImportError: DLL load failed while importing _multiarray_umath: 找不到指定的程序。
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "d:\python39\lib\site-packages\cv2\__init__.py", line 11, in <module>
import numpy
File "d:\python39\lib\site-packages\numpy\__init__.py", line 141, in <module>
from . import core
这个问题还没解决，现在这边存疑，有知道的小伙伴可以评论区分享下，后续如果问题解决了，我会及时更新的
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