Problems using psycopg2 on Mac OS (Yosemite)

Question

Currently I am installing psycopg2 for work within eclipse with python.

I am finding a lot of problems:

1. The first problem sudo pip3.4 install ps

Answer 1

For those of you on El Capitan who can't use @KungFuLucky7's answer - I used the following to fix the issue (Adjust paths to match yours where required).

sudo install_name_tool -change libpq.5.dylib /Library/PostgreSQL/9.5/lib/libpq.5.dylib /usr/local/lib/python2.7/site-packages/psycopg2/_psycopg.so

Answer 2

If you are using PostgresApp, you need to run the following two commands:

sudo mv /usr/lib/libpq.5.dylib /usr/lib/libpq.5.dylib.old
sudo ln -s /Applications/Postgres.app/Contents/Versions/9.4/lib/libpq.5.dylib /usr/lib

Answer 3

Here's a fix that worked for me on El Capitan that doesn't require restarting to work around the OS X El Capitan System Integrity Protection (SIP):

brew unlink postgresql && brew link postgresql
brew link --overwrite postgresql

H/T Farhan Ahmad

Answer 4

I am using yosemite, postgres.app & django. this got psycopg2 to load properly for me but the one difference was that my libpq.5.dylib file is in /Applications/Postgres.app/Contents/Versions/9.4/lib.

thus my second line was sudo ln -s /Applications/Postgres.app/Contents/Versions/9.4/lib/libpq.5.dylib /usr/lib

Answer 5

I was able to fix this on my Mac (running Catalina, 10.15.3) by using psycopg2-binary rather than psycopg2.

pip3 uninstall psycopg2 pip3 install psycopg2-binary

Answer 6

You need to replace the /usr/lib/libpq.5.dylib library because its version is too old.
Here's my solution to this problem:

$ sudo mv /usr/lib/libpq.5.dylib /usr/lib/libpq.5.dylib.old  
$ sudo ln -s /Library/PostgreSQL/9.4/lib/libpq.5.dylib /usr/lib