I tried pip install openbabel --log log_file and I got the following error:
Collecting openbabel
Using cached openbabel-2.4.1.tar.gz (74 kB)
Building wheels for collected packages: openbabel
Building wheel for openbabel (setup.py) ... error
ERROR: Failed building wheel for openbabel
Running setup.py clean for openbabel
Failed to build openbabel
Installing collected packages: openbabel
Running setup.py install for openbabel ... error
ERROR: Command errored out with exit status 1: /usr/local/opt/python/bin/python3.7 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/59/zn1rl7b13tqc7t2njskzp6th0000gn/T/pip-install-d2aqd_xf/openbabel/setup.py'"'"'; __file__='"'"'/private/var/folders/59/zn1rl7b13tqc7t2njskzp6th0000gn/T/pip-install-d2aqd_xf/openbabel/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/59/zn1rl7b13tqc7t2njskzp6th0000gn/T/pip-record-i_0qytcj/install-record.txt --single-version-externally-managed --compile --install-headers /usr/local/include/python3.7m/openbabel Check the logs for full command output.
Here pip is an alias for pip3.
The log file is here (I am not sure if you can read it, this is my first time sharing a file)
note: A few days ago I opened a second user on my computer, I don't know how it affects things but maybe that's the reason.
I am using Mac OS Catalina.
So I found a much simpler way than building openbabel manually. brew install openbabel works for openbabel3
Check the link: http://openbabel.org/wiki/Category:Installation