Christian Bachmaier added the comment:
$ cat hello.py
import _psycopg
print('Works.')
$ export PYTHONVERBOSE=2
$ ./hello 2> res.txt
$ cat res.txt | grep psycopg
# trying /export/scratch/chris/pgtest/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /export/scratch/chris/pgtest/_psycopg.cpython-34m.so
# trying /export/scratch/chris/pgtest/_psycopg.abi3.so
# trying /export/scratch/chris/pgtest/_psycopg.so
# trying /export/scratch/chris/pgtest/_psycopg.py
# trying /export/scratch/chris/pgtest/_psycopg.pyc
# trying /usr/lib/python3.4/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /usr/lib/python3.4/_psycopg.cpython-34m.so
# trying /usr/lib/python3.4/_psycopg.abi3.so
# trying /usr/lib/python3.4/_psycopg.so
# trying /usr/lib/python3.4/_psycopg.py
# trying /usr/lib/python3.4/_psycopg.pyc
# trying
/usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.cpython-34m.so
# trying /usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.abi3.so
# trying /usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.so
# trying /usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.py
# trying /usr/lib/python3.4/plat-x86_64-linux-gnu/_psycopg.pyc
# trying /usr/lib/python3.4/lib-dynload/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /usr/lib/python3.4/lib-dynload/_psycopg.cpython-34m.so
# trying /usr/lib/python3.4/lib-dynload/_psycopg.abi3.so
# trying /usr/lib/python3.4/lib-dynload/_psycopg.so
# trying /usr/lib/python3.4/lib-dynload/_psycopg.py
# trying /usr/lib/python3.4/lib-dynload/_psycopg.pyc
# trying
/usr/local/lib/python3.4/dist-packages/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /usr/local/lib/python3.4/dist-packages/_psycopg.cpython-34m.so
# trying /usr/local/lib/python3.4/dist-packages/_psycopg.abi3.so
# trying /usr/local/lib/python3.4/dist-packages/_psycopg.so
# trying /usr/local/lib/python3.4/dist-packages/_psycopg.py
# trying /usr/local/lib/python3.4/dist-packages/_psycopg.pyc
# trying /usr/lib/python3/dist-packages/_psycopg.cpython-34m-x86_64-linux-gnu.so
# trying /usr/lib/python3/dist-packages/_psycopg.cpython-34m.so
# trying /usr/lib/python3/dist-packages/_psycopg.abi3.so
# trying /usr/lib/python3/dist-packages/_psycopg.so
# trying /usr/lib/python3/dist-packages/_psycopg.py
# trying /usr/lib/python3/dist-packages/_psycopg.pyc
import _psycopg
ImportError: No module named '_psycopg'
----
$ cat hello.py
import _psycopg
print('Works.')
$ export PYTHONPATH=/usr/lib/python3/dist-packages/psycopg2:$PYTHONPATH
$ ./hello
Works.
----
The correct import (see the doc of psycopg2) is import psycopg2. Otherwise a
valid script does even not run in interpreted mode. The library lies in
/usr/lib/python3/dist-packages/psycopg2/_psycopg.cpython...so Maybe there is
the Problem. One has to Import the parent dir of the so-file, which Triggers
the bug.
$ cat hello.py
import psycopg2
print('Works.')
$ export PYTHONVERBOSE=2
$ ./hello 2> res.txt
$ cat res.txt | grep psycopg
import psycopg2
File "/usr/lib/python3/dist-packages/psycopg2/__init__.py", line 67, in
<module>
from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
ImportError: No module named 'psycopg2._psycopg'
# destroy psycopg2
Marc-Andre: would you mind to install python3-psycopg2 to see that in real?
----------
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Python tracker <[email protected]>
<http://bugs.python.org/issue16047>
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