关于在mac上plyvel安装失败的问题

总结

安装plyvel时需要用到leveldb开发库
所以在安装plyvel前，要先安装leveldb

报错提示

我在直接运行pip install plyvel 时
出现了一长串报错

Defaulting to user installation because normal site-packages is not writeable
Collecting plyvel
  Using cached plyvel-1.2.0.tar.gz (145 kB)
Building wheels for collected packages: plyvel
  Building wheel for plyvel (setup.py) ... error
  ERROR: Command errored out with exit status 1:
   command: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/setup.py'"'"'; __file__='"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/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 /private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-wheel-dlRXOW
       cwd: /private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/
  Complete output (18 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.macosx-10.15-x86_64-2.7
  creating build/lib.macosx-10.15-x86_64-2.7/plyvel
  copying plyvel/_version.py -> build/lib.macosx-10.15-x86_64-2.7/plyvel
  copying plyvel/__init__.py -> build/lib.macosx-10.15-x86_64-2.7/plyvel
  running build_ext
  building 'plyvel._plyvel' extension
  creating build/temp.macosx-10.15-x86_64-2.7
  creating build/temp.macosx-10.15-x86_64-2.7/plyvel
  cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c plyvel/_plyvel.cpp -o build/temp.macosx-10.15-x86_64-2.7/plyvel/_plyvel.o -Wall -g -x c++ -std=c++11 -stdlib=libc++
  plyvel/_plyvel.cpp:620:10: fatal error: 'leveldb/db.h' file not found
  #include "leveldb/db.h"
           ^~~~~~~~~~~~~~
  1 error generated.
  error: command 'cc' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for plyvel
  Running setup.py clean for plyvel
Failed to build plyvel
Installing collected packages: plyvel
    Running setup.py install for plyvel ... error
    ERROR: Command errored out with exit status 1:
     command: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/setup.py'"'"'; __file__='"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-record-ujLw5Y/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /Users/hwan/Library/Python/2.7/include/python2.7/plyvel
         cwd: /private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/
    Complete output (18 lines):
    running install
    running build
    running build_py
    creating build
    creating build/lib.macosx-10.15-x86_64-2.7
    creating build/lib.macosx-10.15-x86_64-2.7/plyvel
    copying plyvel/_version.py -> build/lib.macosx-10.15-x86_64-2.7/plyvel
    copying plyvel/__init__.py -> build/lib.macosx-10.15-x86_64-2.7/plyvel
    running build_ext
    building 'plyvel._plyvel' extension
    creating build/temp.macosx-10.15-x86_64-2.7
    creating build/temp.macosx-10.15-x86_64-2.7/plyvel
    cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -iwithsysroot /usr/local/libressl/include -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c plyvel/_plyvel.cpp -o build/temp.macosx-10.15-x86_64-2.7/plyvel/_plyvel.o -Wall -g -x c++ -std=c++11 -stdlib=libc++
    plyvel/_plyvel.cpp:620:10: fatal error: 'leveldb/db.h' file not found
    #include "leveldb/db.h"
             ^~~~~~~~~~~~~~
    1 error generated.
    error: command 'cc' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/setup.py'"'"'; __file__='"'"'/private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-install-3pGhBP/plyvel/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/sy/ymrww60s7wn57zpz7571hgsw0000gn/T/pip-record-ujLw5Y/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /Users/hwan/Library/Python/2.7/include/python2.7/plyvel Check the logs for full command output.

致命错误在下面几行有显示，即找不到’leveldb / db.h’文件

plyvel/_plyvel.cpp:620:10: fatal error: 'leveldb/db.h' file not found
  #include "leveldb/db.h"
           ^~~~~~~~~~~~~~

解决方法

所以，只要安装leveldb即可解决问题
我是用homebrew来进行安装的

brew install leveldb

然后在运行

pip install plyvel

就可以顺利完成安装