错误：无法为使用 PEP 517 且无法直接安装的 bcrypt 构建轮子

Question

pycharm中的解释器配置因为某些原因失效了所以我为我正在做的项目创建了一个新的虚拟环境，并重新安装了依赖项。但是我在再次安装 bcrypt 时遇到了问题。这是完整的错误。该项目在以前的解释器上运行良好，所以我怀疑 python 版本与它有什么关系。我尝试安装轮子以及错误所说的 could not build wheels 但这并没有完成这项工作。

完整的错误：

 Collecting flask-bcrypt
      Using cached https://files.pythonhosted.org/packages/1d/c0/6d4c04d007d72b355de24e7a223978d1a95732245f
    9e9becbf45d3024bf8/Flask-Bcrypt-0.7.1.tar.gz
    Requirement already satisfied: Flask in c:\users\User\appdata\local\programs\python\python38-3
    2\lib\site-packages (from flask-bcrypt) (1.1.2)
    Collecting bcrypt (from flask-bcrypt)
      Using cached https://files.pythonhosted.org/packages/d8/ba/21c475ead997ee21502d30f76fd93ad8d5858d19a3
    fad7cd153de698c4dd/bcrypt-3.2.0.tar.gz
      Installing build dependencies ... done
      Getting requirements to build wheel ... done
        Preparing wheel metadata ... done
    Requirement already satisfied: Jinja2>=2.10.1 in c:\users\User\appdata\local\programs\python\p
    ython38-32\lib\site-packages (from Flask->flask-bcrypt) (2.11.2)
    Requirement already satisfied: Werkzeug>=0.15 in c:\users\User\appdata\local\programs\python\p
    ython38-32\lib\site-packages (from Flask->flask-bcrypt) (1.0.1)
    Requirement already satisfied: itsdangerous>=0.24 in c:\users\User\appdata\local\programs\pyth
    on\python38-32\lib\site-packages (from Flask->flask-bcrypt) (1.1.0)
    Requirement already satisfied: click>=5.1 in c:\users\User\appdata\local\programs\python\pytho
    n38-32\lib\site-packages (from Flask->flask-bcrypt) (7.1.2)
    Requirement already satisfied: six>=1.4.1 in c:\users\User\appdata\roaming\python\python38\sit
    e-packages (from bcrypt->flask-bcrypt) (1.15.0)
    Requirement already satisfied: cffi>=1.1 in c:\users\User\appdata\local\programs\python\python
    38-32\lib\site-packages (from bcrypt->flask-bcrypt) (1.14.2)
    Requirement already satisfied: MarkupSafe>=0.23 in c:\users\User\appdata\local\programs\python
    \python38-32\lib\site-packages (from Jinja2>=2.10.1->Flask->flask-bcrypt) (1.1.1)
    Requirement already satisfied: pycparser in c:\users\User\appdata\local\programs\python\python
    38-32\lib\site-packages (from cffi>=1.1->bcrypt->flask-bcrypt) (2.20)
    Building wheels for collected packages: bcrypt
      Building wheel for bcrypt (PEP 517) ... error
      ERROR: Command errored out with exit status 1:
       command: 'c:\users\User\appdata\local\programs\python\python38-32\python.exe' 'c:\users\User\appdata\local\programs\python\python38-32\lib\site-packages\pip_vendor\pep517_in_process.p
    y' build_wheel 'C:\conda_temp\tmpgl0zt2ul'
           cwd: C:\conda_temp\pip-install-9i9ne9yb\bcrypt
      Complete output (15 lines):
      running bdist_wheel
      running build
      running build_py
      creating build
      creating build\lib.win32-3.8
      creating build\lib.win32-3.8\bcrypt
      copying src\bcrypt__about__.py -> build\lib.win32-3.8\bcrypt
      copying src\bcrypt__init__.py -> build\lib.win32-3.8\bcrypt
      copying src\bcrypt\py.typed -> build\lib.win32-3.8\bcrypt
      running build_ext
      generating cffi module 'build\\temp.win32-3.8\\Release\_bcrypt.c'
      creating build\temp.win32-3.8
      creating build\temp.win32-3.8\Release
      building '_bcrypt' extension
      error: Microsoft Visual C++ 14.0 is required. Get it with "Build Tools for Visual Studio": https://vi
    sualstudio.microsoft.com/downloads/
      ----------------------------------------
      ERROR: Failed building wheel for bcrypt
      Running setup.py clean for bcrypt
    Failed to build bcrypt
    ERROR: Could not build wheels for bcrypt which use PEP 517 and cannot be installed directly
    WARNING: You are using pip version 19.2.3, however version 20.2.2 is available.
    You should consider upgrading via the 'python -m pip install --upgrade pip' command.

原文由 stumbling_errors 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

尝试使用这些命令：

 python -m pip install --upgrade pip
python -m pip install --no-use-pep517 bcrypt

原文由 MANJUNATH B 发布，翻译遵循 CC BY-SA 4.0 许可协议