未能生成opencv python

我在用pycharm。我创建了一个要使用的虚拟环境，当我尝试安装opencv库时，收到一条错误消息

我正在使用pip命令安装openCV：

命令：pip安装opencvpython

这是使用命令时出现的错误消息：

错误：-

Collecting opencv-python
  Using cached https://files.pythonhosted.org/packages/e0/6f/237b730227927c15a68ec831a51bc83837bb65d54bf9651c08b474201b9a/opencv-python-4.4.0.40.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Requirement already satisfied: numpy>=1.17.3 in f:\python\rio python\project rio\reco_env\lib\site-packages (from opencv-python) (1.19.1)
Building wheels for collected packages: opencv-python
  Building wheel for opencv-python (PEP 517) ... error
  Complete output from command "F:\Python\Rio Python\Project Rio\Reco_env\Scripts\python.exe" "F:\Python\Rio Python\Project Rio\Reco_env\lib\site-packages\pip-19.0.3-py3.8.egg\pip\_vendor\pep517\_in_process.py" build_wheel C:\Users\Rio\AppData\Local\Temp\tmpew_pbwjp:
  Not searching for unused variables given on the command line.
  CMake Error: CMake was unable to find a build program corresponding to "Ninja".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  CMake Error at CMakeLists.txt:2 (PROJECT):
    Generator

      Visual Studio 15 2017

    could not find any instance of Visual Studio.



  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  -- The C compiler identification is unknown
  CMake Error at CMakeLists.txt:3 (ENABLE_LANGUAGE):
    The CMAKE_C_COMPILER:

      cl

    is not a full path and was not found in the PATH.

    To use the NMake generator with Visual C++, cmake must be run from a shell
    that can use the compiler cl from the command line.  This environment is
    unable to invoke the cl compiler.  To fix this problem, run cmake from the
    Visual Studio Command Prompt (vcvarsall.bat).

    Tell CMake where to find the compiler by setting either the environment
    variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
    the compiler, or to the compiler name if it is in the PATH.


  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeError.log".
  Not searching for unused variables given on the command line.
  -- The C compiler identification is unknown
  CMake Error at CMakeLists.txt:3 (ENABLE_LANGUAGE):
    The CMAKE_C_COMPILER:

      cl

    is not a full path and was not found in the PATH.

    To use the JOM generator with Visual C++, cmake must be run from a shell
    that can use the compiler cl from the command line.  This environment is
    unable to invoke the cl compiler.  To fix this problem, run cmake from the
    Visual Studio Command Prompt (vcvarsall.bat).

    Tell CMake where to find the compiler by setting either the environment
    variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
    the compiler, or to the compiler name if it is in the PATH.


  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeError.log".


  --------------------------------------------------------------------------------
  -- Trying "Ninja (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Ninja (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "Visual Studio 15 2017 v141" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Visual Studio 15 2017 v141" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "NMake Makefiles (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "NMake Makefiles (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "NMake Makefiles JOM (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "NMake Makefiles JOM (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------

  ********************************************************************************
  scikit-build could not get a working generator for your system. Aborting build.

  Building windows wheels for Python 3.8 requires Microsoft Visual Studio 2017.
  Get it with "Visual Studio 2017":

    https://visualstudio.microsoft.com/vs/

  ********************************************************************************

  ----------------------------------------
  Failed building wheel for opencv-python
  Running setup.py clean for opencv-python
Failed to build opencv-python
Could not build wheels for opencv-python which use PEP 517 and cannot be installed directly

我还安装了Visual Studio Community 2019，并尝试了Visual Studio Community 2017，但仍然存在相同的问题

---

有人知道如何解决这个问题吗？

安装anaconda…我也遇到了同样的问题…但anaconda只是解决了这个问题

我相信您的问题正在发生，因为Cmake无法在您的系统路径中找到cl编译器。根据安装的VisualStudio尝试定位它，然后将其添加到系统路径中

这是可以找到cl.exe的路径示例。现在我的是14.0，但你的可能不同

C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin

---

解决方案：pip3安装--升级pip setuptools wheel

C:\Program Files（x86）\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\Hostx64\x64我在该位置找到了cl.exe文件，接下来该怎么办？检查此链接：您可以跳过答案中显示的第一步（另一个答案解释了如何操作）我已经安装了anaconda，在我的vs代码中，在虚拟环境中安装时没有问题。我使用pycharm构建了一个小型项目，但我遇到了这个问题为什么这是解决方案？也就是说，它是如何工作的，为什么要解决问题。请理解，这里解释的答案比代码答案更容易理解。