如何解决错误“错误：命令错误，退出状态1：python”尝试使用pip安装opcua时

问题描述

我正在尝试在Windows中安装FreeOpcUa / python-opcua，但它始终运行错误。

我正在使用最新的python 3.9和已经更新的python3.9工具。最初的错误是“需要Microsoft Visual C ++ 14.0。请使用Microsoft Visual C ++生成工具获取它”。因此，我稍后安装并更新了Visual C ++ Build Tools。但是运行安装命令后，却出现以下错误。

pip install opcua

错误：

Collecting lxml
  Using cached lxml-4.5.2.tar.gz (4.5 MB)
Requirement already satisfied: pytz in c:\python\python39\lib\site-packages (from opcua) (2020.1)
Requirement already satisfied: python-dateutil in c:\python\python39\lib\site-packages (from opcua) (2.8.1)
Requirement already satisfied: six>=1.5 in c:\python\python39\lib\site-packages (from python-dateutil->opcua) (1.15.0)
Building wheels for collected packages: lxml
  Building wheel for lxml (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: 'c:\python\python39\python.exe' -u -c 'import sys,setuptools,tokenize; sys.argv[0] = '"'"'C:\\Users\\Shakir.Showmik\\AppData\\Local\\Temp\\pip-install-t5ivc0ym\\lxml\\setup.py'"'"'; __file__='"'"'C:\\Users\\Shakir.Showmik\\AppData\\Local\\Temp\\pip-install-t5ivc0ym\\lxml\\setup.py'"'"';f=getattr(tokenize,'"'"'open'"'"',open)(__file__);code=f.read().replace('"'"'\r\n'"'"','"'"'\n'"'"');f.close();exec(compile(code,__file__,'"'"'exec'"'"'))' bdist_wheel -d 'C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-wheel-7r9rl8u7'
       cwd: C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-install-t5ivc0ym\lxml\
  Complete output (94 lines):
  Building lxml version 4.5.2.
  Building without Cython.
  Building against pre-built libxml2 andl libxslt libraries
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build\lib.win-amd64-3.9
  creating build\lib.win-amd64-3.9\lxml
  copying src\lxml\builder.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\cssselect.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\doctestcompare.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\ElementInclude.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\pyclasslookup.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\sax.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\usedoctest.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\_elementpath.py -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\__init__.py -> build\lib.win-amd64-3.9\lxml
  creating build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\__init__.py -> build\lib.win-amd64-3.9\lxml\includes
  creating build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\builder.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\clean.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\defs.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\diff.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\ElementSoup.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\formfill.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\html5parser.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\soupparser.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\usedoctest.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\_diffcommand.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\_html5builder.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\_setmixin.py -> build\lib.win-amd64-3.9\lxml\html
  copying src\lxml\html\__init__.py -> build\lib.win-amd64-3.9\lxml\html
  creating build\lib.win-amd64-3.9\lxml\isoschematron
  copying src\lxml\isoschematron\__init__.py -> build\lib.win-amd64-3.9\lxml\isoschematron
  copying src\lxml\etree.h -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\etree_api.h -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\lxml.etree.h -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\lxml.etree_api.h -> build\lib.win-amd64-3.9\lxml
  copying src\lxml\includes\c14n.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\config.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\dtdvalid.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\etreepublic.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\htmlparser.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\relaxng.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\schematron.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\tree.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\uri.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xinclude.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xmlerror.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xmlparser.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xmlschema.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xpath.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\xslt.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\__init__.pxd -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\etree_defs.h -> build\lib.win-amd64-3.9\lxml\includes
  copying src\lxml\includes\lxml-version.h -> build\lib.win-amd64-3.9\lxml\includes
  creating build\lib.win-amd64-3.9\lxml\isoschematron\resources
  creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\rng
  copying src\lxml\isoschematron\resources\rng\iso-schematron.rng -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\rng
  creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
  copying src\lxml\isoschematron\resources\xsl\RNG2Schtrn.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
  copying src\lxml\isoschematron\resources\xsl\XSD2Schtrn.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
  creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_abstract_expand.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_dsdl_include.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_message.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_skeleton_for_xslt1.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_svrl_for_xslt1.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\readme.txt -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
  running build_ext
  building 'lxml.etree' extension
  creating build\temp.win-amd64-3.9
  creating build\temp.win-amd64-3.9\Release
  creating build\temp.win-amd64-3.9\Release\src
  creating build\temp.win-amd64-3.9\Release\src\lxml
  C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -DCYTHON_CLINE_IN_TRACEBACK=0 -Isrc -Isrc\lxml\includes -Ic:\python\python39\include -Ic:\python\python39\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /Tcsrc\lxml\etree.c /Fobuild\temp.win-amd64-3.9\Release\src\lxml\etree.obj -w
  cl : Command line warning D9025 : overriding '/W3' with '/w'
  etree.c
  C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-install-t5ivc0ym\lxml\src\lxml\includes/etree_defs.h(14): fatal error C1083: Cannot open include file: 'libxml/xmlversion.h': No such file or directory
  Compile failed: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
  creating Users
  creating Users\SHAKIR~1.SHO
  creating Users\SHAKIR~1.SHO\AppData
  creating Users\SHAKIR~1.SHO\AppData\Local
  creating Users\SHAKIR~1.SHO\AppData\Local\Temp
  C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -I/usr/include/libxml2 -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /TcC:\Users\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInit5t7_ip7e.c /FoUsers\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInit5t7_ip7e.obj
  xmlXPathInit5t7_ip7e.c
  C:\Users\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInit5t7_ip7e.c(1): fatal error C1083: Cannot open include file: 'libxml/xpath.h': No such file or directory
  error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
  *********************************************************************************
  Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
  *********************************************************************************
  ----------------------------------------
  ERROR: Failed building wheel for lxml
  Running setup.py clean for lxml
Failed to build lxml
Installing collected packages: lxml,opcua
    Running setup.py install for lxml ... error
    ERROR: Command errored out with exit status 1:
     command: 'c:\python\python39\python.exe' -u -c 'import sys,'"'"'exec'"'"'))' install --record 'C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-record-mfavv167\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\python\python39\Include\lxml'
         cwd: C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-install-t5ivc0ym\lxml\
    Complete output (89 lines):
    Building lxml version 4.5.2.
    Building without Cython.
    Building against pre-built libxml2 andl libxslt libraries
    running install
    running build
    running build_py
    creating build
    creating build\lib.win-amd64-3.9
    creating build\lib.win-amd64-3.9\lxml
    copying src\lxml\builder.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\cssselect.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\doctestcompare.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\ElementInclude.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\pyclasslookup.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\sax.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\usedoctest.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\_elementpath.py -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\__init__.py -> build\lib.win-amd64-3.9\lxml
    creating build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\__init__.py -> build\lib.win-amd64-3.9\lxml\includes
    creating build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\builder.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\clean.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\defs.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\diff.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\ElementSoup.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\formfill.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\html5parser.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\soupparser.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\usedoctest.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\_diffcommand.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\_html5builder.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\_setmixin.py -> build\lib.win-amd64-3.9\lxml\html
    copying src\lxml\html\__init__.py -> build\lib.win-amd64-3.9\lxml\html
    creating build\lib.win-amd64-3.9\lxml\isoschematron
    copying src\lxml\isoschematron\__init__.py -> build\lib.win-amd64-3.9\lxml\isoschematron
    copying src\lxml\etree.h -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\etree_api.h -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\lxml.etree.h -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\lxml.etree_api.h -> build\lib.win-amd64-3.9\lxml
    copying src\lxml\includes\c14n.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\config.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\dtdvalid.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\etreepublic.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\htmlparser.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\relaxng.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\schematron.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\tree.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\uri.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xinclude.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xmlerror.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xmlparser.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xmlschema.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xpath.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\xslt.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\__init__.pxd -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\etree_defs.h -> build\lib.win-amd64-3.9\lxml\includes
    copying src\lxml\includes\lxml-version.h -> build\lib.win-amd64-3.9\lxml\includes
    creating build\lib.win-amd64-3.9\lxml\isoschematron\resources
    creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\rng
    copying src\lxml\isoschematron\resources\rng\iso-schematron.rng -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\rng
    creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
    copying src\lxml\isoschematron\resources\xsl\RNG2Schtrn.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
    copying src\lxml\isoschematron\resources\xsl\XSD2Schtrn.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl
    creating build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_abstract_expand.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_dsdl_include.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_message.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_schematron_skeleton_for_xslt1.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\iso_svrl_for_xslt1.xsl -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    copying src\lxml\isoschematron\resources\xsl\iso-schematron-xslt1\readme.txt -> build\lib.win-amd64-3.9\lxml\isoschematron\resources\xsl\iso-schematron-xslt1
    running build_ext
    building 'lxml.etree' extension
    creating build\temp.win-amd64-3.9
    creating build\temp.win-amd64-3.9\Release
    creating build\temp.win-amd64-3.9\Release\src
    creating build\temp.win-amd64-3.9\Release\src\lxml
    C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -DCYTHON_CLINE_IN_TRACEBACK=0 -Isrc -Isrc\lxml\includes -Ic:\python\python39\include -Ic:\python\python39\include -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /Tcsrc\lxml\etree.c /Fobuild\temp.win-amd64-3.9\Release\src\lxml\etree.obj -w
    cl : Command line warning D9025 : overriding '/W3' with '/w'
    etree.c
    C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-install-t5ivc0ym\lxml\src\lxml\includes/etree_defs.h(14): fatal error C1083: Cannot open include file: 'libxml/xmlversion.h': No such file or directory
    Compile failed: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
    C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\bin\HostX86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -I/usr/include/libxml2 -IC:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\VC\Tools\MSVC\14.27.29110\include -IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.8\include\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\ucrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\shared -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\um -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\winrt -IC:\Program Files (x86)\Windows Kits\10\include\10.0.18362.0\cppwinrt /TcC:\Users\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInittzjvux42.c /FoUsers\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInittzjvux42.obj
    xmlXPathInittzjvux42.c
    C:\Users\SHAKIR~1.SHO\AppData\Local\Temp\xmlXPathInittzjvux42.c(1): fatal error C1083: Cannot open include file: 'libxml/xpath.h': No such file or directory
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC\\Tools\\MSVC\\14.27.29110\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
    *********************************************************************************
    Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
    *********************************************************************************
    ----------------------------------------
ERROR: Command errored out with exit status 1: 'c:\python\python39\python.exe' -u -c 'import sys,'"'"'exec'"'"'))' install --record 'C:\Users\Shakir.Showmik\AppData\Local\Temp\pip-record-mfavv167\install-record.txt' --single-version-externally-managed --compile --install-headers 'c:\python\python39\Include\lxml' Check the logs for full command output.
`

解决方法

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