OS X comes with Python 2.7.5 already; when you install Python with Homebrew, it puts a newer version in a different place without touching the built-in one. Homebrew's Python also comes with Pip, whereas OS X's doesn't. What's going on here is, you're using Homebrew's pip
to install psycopg2, then running OS X's python
and trying to import it.
Run /usr/local/bin/python
(the full path to Homebrew's Python), and try import psycopg2
from there.
If that works, you need to put /usr/local/bin
before /usr/bin
in your PATH
variable, so that your shell finds Homebrew's Python before the OS X one every time. If you use Bash (the default shell in OS X), you can do this by putting the following in your .bash_profile
:
export PATH=/usr/local/bin:$PATH
To make sure that you're running the right Python in scripts, use the following shebang line:
#!/usr/bin/env python
env
will search PATH
for Python and run the script with the first one it finds, the same as typing python
from your shell. Bash scripts and such should inherit the PATH
variable and find the right python without changes.
You can also hardcode the path to Homebrew Python in your shebang line (#!/usr/local/bin/python
), but this means your script will only work on OS X machines with a Homebrew Python installed, and is best avoided.