Error while installing lxml through pip: Microsoft

问题:

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-

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

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 -

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.

回答1:

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.

回答2:

1. Run pip install wheel
2. Download lxml from 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

回答3:

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.

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:

回答4:

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

conda install -c conda-forge scrapy

回答5:

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

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!

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)

回答6:

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.

回答7:

First:

pip install wheel

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

pip install the file you downloaded (.whl).