GDBM 不适用于 Python 3.6 和 anaconda

Question

I use Python 3.6 in an anaconda environment. I installed GDBM with

conda install gdbm

The installation went well, however I can't use dbm.gnu from Python:

ModuleNotFoundError: No module named '_gdbm'

It seams that Python doesn't include the _gdbm module, even if GDBM is actually installed.

Is this a known problem? How can I fix it?

Thanks!

Answer 1

I faced this issue as well. This is probably not the ideal way, but it works. I did the following to resolve this -

sudo apt-get install python3-gdbm

This installs the gdbm library for python3, however since apt-get and anaconda are two independent package managers; this isn't going to solve your problem. We primarily do this to get a hold of the.so shared library which we will place in the right folder in our anaconda installation. Next we find the location of the.so file using -

dpkg -L python3-gdbm

This gives us the following output -

/.
/usr
/usr/lib
/usr/lib/python3.5
/usr/lib/python3.5/lib-dynload
/usr/lib/python3.5/lib-dynload/_gdbm.cpython-35m-x86_64-linux-gnu.so
/usr/share
/usr/share/doc
/usr/share/doc/python3-gdbm
/usr/share/doc/python3-gdbm/copyright
/usr/share/doc/python3-gdbm/changelog.Debian.gz
/usr/share/doc/python3-gdbm/README.Debian

The file we require is here -

/usr/lib/python3.5/lib-dynload/_gdbm.cpython-35m-x86_64-linux-gnu.so

Copy this file to the lib-dynload folder of your anaconda installation; for me this was -

cp /usr/lib/python3.5/lib-dynload/_gdbm.cpython-35m-x86_64-linux-gnu.so /home/username/anaconda3/lib/python3.5/lib-dynload

Note, that this will only work if the directory the .so was copied to is in python's sys.path . To find the correct directory to copy to, assuming you're inside the activated conda environment, run:

python -c 'import sys; [print(x) for x in sys.path if "lib-dynload" in x]'

For example, in my case, the directory was inside the environment path and not in the anaconda main library. ~/anaconda3/envs/myenvname/lib/python3.7/lib-dynload

Now try importing the module in python -

from _gdbm import *

or testing it from the command line:

python -m dbm.gnu

This should have fixed your problem.

Please note, mine is an Ubuntu-16.06 OS and my python version is 3.5.2. The.so file may work with python3.6 as well, if not you can try installing python3.6-gdbm, although a quick search for ubuntu 16.04 didn't give me any results.

Answer 2

Although the question is for Python3, I got here while trying to install gdbm on Python2 so I post my answer as it may be useful for others. The correct command was conda install python-gdbm . Although conda install gdbm went through, the module couldn't be imported. As per here , however, this may not work for Python3.

Answer 3

The answer from @stason worked for me with a little modification regarding the destination route for the.so file. I copied the files to the lib-dynload folder in the environment to make this work.

Instead of: /home/username/anaconda3/lib/python3.X/lib-dynload

I used: /home/username/anaconda3/envs/**your_env**/lib/python3.X/lib-dynload

Doing the same but pointing to this folder worked for me. I hope this helps anyone with the issue.

Thanks!