Python 通过 pip 安装 lxml 时出错：需要 Microsoft Visual C++ 14.0

Error while installing lxml through pip: Microsoft Visual C++ 14.0 is required

提问by Zeokav

I am on a windows 10 machine and recently moved from python 2.7 to 3.5. When trying to install lxml through pip, it stops and throws this error message-

我在 Windows 10 机器上，最近从 python 2.7 迁移到 3.5。尝试通过 pip 安装 lxml 时，它会停止并抛出此错误消息 -

building 'lxml.etree' extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools

构建“lxml.etree”扩展
错误：需要 Microsoft Visual C++ 14.0。使用“Microsoft Visual C++ 构建工具”获取它：http: //landinghub.visualstudio.com/visual-cpp-build-tools

I have a working copy of VS 2015 installed. When I try to install the visual cpp tools through that link, it says that Microsoft Visual Studio 2015 is already installed on the machine. I also tried installing visual studio c++ 2015 redistributables, both 64 and 32 bit versions, but both of them say that there's another version of the product already installed.
typing set in the command prompt includes this -

我安装了 VS 2015 的工作副本。当我尝试通过该链接安装 Visual cpp 工具时，它说机器上已经安装了 Microsoft Visual Studio 2015。我还尝试安装 64 位和 32 位版本的 Visual Studio c++ 2015 可再发行组件，但他们都说已经安装了该产品的另一个版本。
在命令提示符中输入 set 包括这个 -

VS140COMNTOOLS=C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\

VS140COMNTOOLS=C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\

Which means that the path is set.
This is probably the only resource I could find on SO, but the answer suggests rolling back to Python 3.4.3 from 3.5. Has anybody resolved problems of this kind?
Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)
EDIT: I managed to install it using the precompiled binary (Thanks Paul), but I would still like to know what's causing this.

这意味着设置了路径。
这可能是我能在 SO 上找到的唯一资源，但答案建议从 3.5 回滚到 Python 3.4.3。有没有人解决过此类问题？
需要 Microsoft Visual C++ 14.0（无法找到 vcvarsall.bat）
编辑：我设法使用预编译的二进制文件安装了它（感谢 Paul），但我仍然想知道是什么导致了这种情况。

回答by davidsheldon

Have you checked that when you installed Visual Studio, you installed the C++ compiler? It seems like a silly question, but this is the mistake I made. Check by going into the setup for visual studio (Programs and features: Modify "Visual Studio 2015"), then under Programming Languages->VC++, make sure it's ticked.

您是否检查过安装 Visual Studio 时是否安装了 C++ 编译器？这似乎是一个愚蠢的问题，但这是我犯的错误。通过进入 Visual Studio 的设置（程序和功能：修改“Visual Studio 2015”）进行检查，然后在 下Programming Languages->VC++，确保它已打勾。

回答by Chris Leung

1. Run pip install wheel
2. Download lxmlfrom http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml, if your python version is 3.5 , download lxml-3.6.4-cp35-cp35m-win32.whl.
3. Run python -m pip install lxml-3.6.4-cp35-cp35m-win32.whl

1. 跑 pip install wheel
2. 从http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml下载lxml，如果您的 python 版本是 3.5，请下载.lxml-3.6.4-cp35-cp35m-win32.whl
3. 跑 python -m pip install lxml-3.6.4-cp35-cp35m-win32.whl

回答by Eric G

As an update to the answer from @davidsheldon above, if you want to use Visual Studio Build Tools 2017 instead of 2015, it will work.

作为上面@davidsheldon 答案的更新，如果您想使用 Visual Studio Build Tools 2017 而不是 2015，它会起作用。

I found that the default install of the build tools stand alone was not enough, however, I added `VC++ 2015.3 ... toolset for desktop (x86,x64) and then python was happy:

我发现单独安装构建工具的默认安装是不够的，但是，我添加了`VC++ 2015.3 ...桌面工具集（x86，x64），然后python很高兴：

回答by Vingt Cent

I've found another solution to get through this: Because I use anaconda python, so I use this code:

我找到了另一个解决方案来解决这个问题：因为我使用 anaconda python，所以我使用以下代码：

conda install -c conda-forge scrapy

回答by Undo

I have same question with you! I found a way no need install vs2015,maybe,you just haven't install twisted.http://www.lfd.uci.edu/~gohlke/pythonlibs/#twisted.download twisted --version（Twisted?17.5.0?cp36?cp36m?win_amd64.whl）(maybe win_amd32.whl if 64didn't work)，and run : pip PATH + filename

我和你有同样的问题！我找到了一种不需要安装 vs2015 的方法，也许，你只是没有安装扭曲。http://www.lfd.uci.edu/~gohlke/pythonlibs/#twisted.downloadtwisted --version（Twisted?17.5.0?cp36?cp36m?win_amd64.whl）（如果64不工作，可能是win_amd32.whl )，然后运行：pip PATH + filename

pip install C:\Users\CR\Downloads\Twisted-17.5.0-cp36-cp36m-win_amd64.whl

pip install Scrapy

I just install successful! good luck for you!

我刚刚安装成功！祝你好运！

my step to insatll scrapy: 1.pip install wheel 2.pip install lxml 3.pip install pyOpenSSL 4.pip install Twisted (fault->do like above) 5.install pywin32 form : https://sourceforge.net/projects/pywin32/files/pywin32/Build%20220/6.pip Scrapy (succesful)

我安装srapy的步骤： 1.pip install wheel 2.pip install lxml 3.pip install pyOpenSSL 4.pip install Twisted (fault->do like above) 5.install pywin32 form：https://sourceforge.net/projects/ pywin32/files/pywin32/Build%20220/6.pip Scrapy（成功）

回答by CPhelefu

Had the same problem and noticed that I had installed the 32bit version in a 64bit machine. All I did was uninstall the wrong one and install the right version and it worked fine.

有同样的问题，并注意到我在 64 位机器上安装了 32 位版本。我所做的只是卸载了错误的版本并安装了正确的版本，并且运行良好。

回答by pejaming

First:

第一的：

pip install wheel

Second： go to http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxmland download proper wheel.

第二：到http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml下载合适的轮子。

pip installthe file you downloaded (.whl).

pip install您下载的文件 (.whl)。