安裝pydensecrf時報錯：
(venv) dorothy@dorothy-MS-7A94:~/project/venv/bin$ pip install pydensecrf
Collecting pydensecrf
Using cached https://files.pythonhosted.org/packages/31/5a/1c2ab48e8019d282c128bc5c621332267bb954d32eecdda3ba57306b1551/pydensecrf-1.0rc3.tar.gz
Building wheels for collected packages: pydensecrf
Running setup.py bdist_wheel for pydensecrf ... error
Complete output from command /home/dorothy/project2/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-6jjoctul/pydensecrf/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 /tmp/tmph56xsy38pip-wheel- --python-tag cp35:
running bdist_wheel
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.5
creating build/lib.linux-x86_64-3.5/pydensecrf
copying pydensecrf/__init__.py -> build/lib.linux-x86_64-3.5/pydensecrf
copying pydensecrf/utils.py -> build/lib.linux-x86_64-3.5/pydensecrf
running build_ext
building 'pydensecrf.eigen' extension
creating build/temp.linux-x86_64-3.5
creating build/temp.linux-x86_64-3.5/pydensecrf
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -Ipydensecrf/densecrf/include -I/home/dorothy/project2/venv/include -I/usr/include/python3.5m -c pydensecrf/eigen.cpp -o build/temp.linux-x86_64-3.5/pydensecrf/eigen.o
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
pydensecrf/eigen.cpp:23:20: fatal error: Python.h: 沒有那個文件或目錄
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Failed building wheel for pydensecrf
Running setup.py clean for pydensecrf
Failed to build pydensecrf
Installing collected packages: pydensecrf
Running setup.py install for pydensecrf ... error
Complete output from command /home/dorothy/project2/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-6jjoctul/pydensecrf/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-hgybpc8s-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/dorothy/project2/venv/include/site/python3.5/pydensecrf:
running install
running build
running build_py
creating build
creating build/lib.linux-x86_64-3.5
creating build/lib.linux-x86_64-3.5/pydensecrf
copying pydensecrf/__init__.py -> build/lib.linux-x86_64-3.5/pydensecrf
copying pydensecrf/utils.py -> build/lib.linux-x86_64-3.5/pydensecrf
running build_ext
building 'pydensecrf.eigen' extension
creating build/temp.linux-x86_64-3.5
creating build/temp.linux-x86_64-3.5/pydensecrf
x86_64-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -Ipydensecrf/densecrf/include -I/home/dorothy/project2/venv/include -I/usr/include/python3.5m -c pydensecrf/eigen.cpp -o build/temp.linux-x86_64-3.5/pydensecrf/eigen.o
cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++
pydensecrf/eigen.cpp:23:20: fatal error: Python.h: 沒有那個文件或目錄
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
----------------------------------------
Command "/home/dorothy/project2/venv/bin/python -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-6jjoctul/pydensecrf/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-hgybpc8s-record/install-record.txt --single-version-externally-managed --compile --install-headers /home/dorothy/project2/venv/include/site/python3.5/pydensecrf" failed with error code 1 in /tmp/pip-build-6jjoctul/pydensecrf/
You are using pip version 9.0.1, however version 19.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
解決方法：
在
pip install pydensecrf
之前加上sudo，即：
(venv) dorothy@dorothy-MS-7A94:~/project/venv/bin$ sudo pip install pydensecrf
sudo: /etc/sudoers.d 可被任何人寫
The directory '/home/dorothy/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/home/dorothy/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting pydensecrf
Downloading https://files.pythonhosted.org/packages/31/5a/1c2ab48e8019d282c128bc5c621332267bb954d32eecdda3ba57306b1551/pydensecrf-1.0rc3.tar.gz (1.0MB)
100% |████████████████████████████████| 1.0MB 173kB/s
Installing collected packages: pydensecrf
Running setup.py install for pydensecrf ... done
Successfully installed pydensecrf-1.0rc3
You are using pip version 8.1.1, however version 19.2.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.