ImportError: /usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.58.0: undefined symbol: PyClass_Type

[unicornlox]

When I import the PGMagick module I get this error:(from pgmagick import gminfo)(python3.6, ubuntu 16.04)thank you very much for your help.

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/pgmagick/__init__.py", line 1, in <module>
    from pgmagick import _pgmagick
ImportError: /usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.58.0: undefined symbol: PyClass_Type

[komackaj]

Hi,

thank you for the report. Looks like the compiled module has bad linkage.

Have you installed it from PyPi (using pip) or compiled from source? Could you post pip's output / your compilation procedure? Do you use some special PPA repositories for python - according to this Python 3.5 is default in Xenial.

[ThimoNeubauer]

I've got apparently the same issue on MacOS:

>>> import pgmagick
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/pgmagick-0.6.5-py3.6-macosx-10.13-x86_64.egg/pgmagick/__init__.py", line 1, in <module>
    from pgmagick import _pgmagick
ImportError: dlopen(/usr/local/lib/python3.6/site-packages/pgmagick-0.6.5-py3.6-macosx-10.13-x86_64.egg/pgmagick/_pgmagick.cpython-36m-darwin.so, 2): Symbol not found: _PyClass_Type
  Referenced from: /usr/local/opt/boost-python/lib/libboost_python-mt.dylib
  Expected in: flat namespace
 in /usr/local/opt/boost-python/lib/libboost_python-mt.dylib

I'm pasting the installation log below. Note that Boost Python was installed right before pgmagick was built: the linkage should be consistent that way. What I suspect is that Boost Python was built against Python 2.7? The Ubunto error above also looks like a Python version mismatch

Flunder:~ thimo$ brew tap hhatto/pgmagick
==> Tapping hhatto/pgmagick
Cloning into '/usr/local/Homebrew/Library/Taps/hhatto/homebrew-pgmagick'...
remote: Counting objects: 6, done.
remote: Compressing objects: 100% (5/5), done.
remote: Total 6 (delta 0), reused 2 (delta 0), pack-reused 0
Unpacking objects: 100% (6/6), done.
Tapped 1 formula (31 files, 23.7KB)
Flunder:~ thimo$ brew install pgmagick --with-python3
==> Installing pgmagick from hhatto/pgmagick
==> Installing dependencies for hhatto/pgmagick/pgmagick: sqlite, boost-python
==> Installing hhatto/pgmagick/pgmagick dependency: sqlite
==> Downloading https://homebrew.bintray.com/bottles/sqlite-3.23.1.high_sierra.b
==> Downloading from https://akamai.bintray.com/0b/0b5f0e6d1096fbed10367e53c13c0
######################################################################## 100.0%
==> Pouring sqlite-3.23.1.high_sierra.bottle.tar.gz
==> Caveats
This formula is keg-only, which means it was not symlinked into /usr/local,
because macOS provides an older sqlite3.

If you need to have this software first in your PATH run:
  echo 'export PATH="/usr/local/opt/sqlite/bin:$PATH"' >> ~/.bash_profile

For compilers to find this software you may need to set:
    LDFLAGS:  -L/usr/local/opt/sqlite/lib
    CPPFLAGS: -I/usr/local/opt/sqlite/include
For pkg-config to find this software you may need to set:
    PKG_CONFIG_PATH: /usr/local/opt/sqlite/lib/pkgconfig

==> Summary
🍺  /usr/local/Cellar/sqlite/3.23.1: 11 files, 3MB
==> Installing hhatto/pgmagick/pgmagick dependency: boost-python
==> Downloading https://homebrew.bintray.com/bottles/boost-python-1.66.0_1.high_
==> Downloading from https://akamai.bintray.com/90/908a5484b565b1ee55ccec7d1f3e1
######################################################################## 100.0%
==> Pouring boost-python-1.66.0_1.high_sierra.bottle.tar.gz
🍺  /usr/local/Cellar/boost-python/1.66.0_1: 457 files, 17.3MB
==> Installing hhatto/pgmagick/pgmagick --with-python3
==> Downloading https://github.com/hhatto/pgmagick/archive/ver0.6.5.tar.gz
==> Downloading from https://codeload.github.com/hhatto/pgmagick/tar.gz/ver0.6.5
######################################################################## 100.0%
==> python3 setup.py install --prefix=/usr/local/Cellar/pgmagick/0.6.5
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink lib/python3.6/site-packages/easy-install.pth
Target /usr/local/lib/python3.6/site-packages/easy-install.pth
already exists. You may want to remove it:
  rm '/usr/local/lib/python3.6/site-packages/easy-install.pth'

To force the link and overwrite all conflicting files:
  brew link --overwrite pgmagick

To list all files that would be deleted:
  brew link --overwrite --dry-run pgmagick

Possible conflicting files are:
/usr/local/lib/python3.6/site-packages/easy-install.pth
==> Summary
🍺  /usr/local/Cellar/pgmagick/0.6.5: 23 files, 5.8MB, built in 7 minutes 6 seconds
Flunder:~ thimo$ rm '/usr/local/lib/python3.6/site-packages/easy-install.pth'
Flunder:~ thimo$ brew link --overwrite pgmagick
Linking /usr/local/Cellar/pgmagick/0.6.5... 13 symlinks created

[komackaj]

@ThimoNeubauer Thank you for reporting. Linking with Boost Python for python3 is always a tricky one. I currently have no access to MacOS machine, so I cannot reproduce, moreover the build pipeline for Homebrew is different from the Linux one.

@hhatto Could you look into this and maybe create a separate issue for Homebrew? Maybe is fixed for current version (I can see from the logs 0.6.5 is built).

[JIAZHEN]

I have a similar issue,

>>> import pgmagick as pg
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/var/www/application/deploy/shared/site-packages/pgmagick/__init__.py", line 1, in <module>
    from pgmagick import _pgmagick
ImportError: /usr/lib64/libboost_python-mt.so.1.53.0: undefined symbol: PyClass_Type

It must be something to do with the python3 and boost-python ..

[JIAZHEN]

@hhatto & @komackaj could you please have a look?

[JIAZHEN]

In my case, the linux is AWS ami which is redhat. The boost-devel package doesn't include libboost-python3x.

[JIAZHEN]

I solved it ... Nightmare to install it on aws ami.

[arycloud]

I have the similar issue on Mac OS Mojave with Python 3 using pip install pgmagick using Pycharm:
<module> from pgmagick import _pgmagick ImportError: dlopen(/Users/abdul/ImgSegEnv/lib/python3.6/site-packages/pgmagick/_pgmagick.cpython-36m-darwin.so, 2): Library not loaded: /usr/local/opt/boost-python3/lib/libboost_python36.dylib Referenced from: /Users/abdul/ImgSegEnv/lib/python3.6/site-packages/pgmagick/_pgmagick.cpython-36m-darwin.so Reason: image not found

[MedhatAhmed]

I solved it ... Nightmare to install it on aws ami.

how did you resolve the issue :)

[totalspam]

I have the same issue after success install boost, harfbuzz and mapnik libraries from source with make install (Ubuntu 18.04):
python3 -c "import mapnik;print(mapnik.__file__)" Traceback (most recent call last): File "<string>", line 1, in <module> File "/root/src/python-mapnik/mapnik/__init__.py", line 74, in <module> from ._mapnik import * ImportError: /usr/lib/x86_64-linux-gnu/libboost_python-py27.so.1.65.1: undefined symbol: PyClass_Type