cannot execute binary file (Python 3.0.1)

Ned Deily nad at
Sun Mar 1 10:52:40 CET 2009

In article 
<b756d6fc-4959-4412-8bb7-7ce94fabf821 at>,
 cf29 <charly.founes at> wrote:
> On Mac OS 10.5.6, I updated Python to version 3.0.1.
> When I want to run a py file, I get an error:
> xxx:~ xxx$ cd '/Users/xxx/Documents/programmingPractice/' && '/usr/
> local/bin/python'  '/Users/xxx/Documents/programmingPractice/
>'  && echo Exit status: $? && exit 1
> -bash: /usr/local/bin/python: cannot execute binary file
> This wasn't an issue with Python 2.6, please let me know how to solve
> this problem.

It appears you are trying to run a python script by double-clicking on 
it and that Python is the default application associated 
with .py files.  The default setting in Python Launcher is to use the 
python linked to /use/local/bin/pythonw.  By default, the OS X 3.0.1 
installer does not install or modify the links in /usr/local/bin/, 
unlike 2.x installers.  That is a problem for Python Launcher.  Here are 
a few options, assuming you used the 3.0.1 installer:

1. You can start up the installer again, choose Customize, and then 
select and install the "UNIX command-line tools" package.  
/usr/local/bin/pythonw will now point out at python 3.0.1 rather than 
python 2.6.

2. Launch Python Launcher and change its Preferences.  Python Launcher 
should be in the /Applications/Python 3.0 folder.  Select Preferences 
and in the Interpreter field enter the full path to python3.0, which is:

3. Use IDLE instead of Python Launcher to run scripts.  Just launch IDLE 
(it's also in /Applications/Python 3.0) and open the script file from 
IDLE's menu bar.  Or drag-drop the script onto the IDLE icon in the 
Dock.  If you want to be able to double-click on the file in the Finder, 
you'll need to change the default application associated with .py files.  
In a Finder window or the desktop select your python script file but 
don't double-click it.  Instead, choose the FInder's "Get Info" command 
and in the resulting Info window choose IDLE 3.0.1 in the "Open with" 
list.  To open all .py files with IDLE, if necessary click on the 
padlock in the lower right-hand corner of the Info window to 
authenticate, then click on the Change All.. button.

4. Run your scripts in a terminal window using python3.0 from the shell 
command line.  You can use the above path to execute python; it might 
help to create a shell alias for it.  Or double-click on the Update 
Shell Profile command in /Applications/Python 3.0 to cause python3.0 to 
be added to your shell PATH and then just type python3.0.

I would recommend either (or both) of the last two approaches.  You'll 
be better off avoiding Python Launcher.

 Ned Deily,
 nad at

More information about the Python-list mailing list