Is path broken for anaconda ipython?

Question

I wish to use anaconda distribution of ipython, but typing ipython at the terminal produces an error message:

Traceback (most recent call last):
  File "/usr/local/bin/ipython", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in <module>
    working_set.require(__requires__)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    raise DistributionNotFound(req)  # XXX put more info here
pkg_resources.DistributionNotFound: ipython==0.13.1

Adding PATH to .bash_profile as below produces the same error message. Asking which python produces //anaconda/bin/python, and which ipython produces /usr/local/bin/ipython. How can I fix this such that ipython launches anaconda ipython?

# MacPorts Installer addition on 2012-11-03_at_23:50:01: adding an appropriate PATH variable for use with MacPorts.
export PATH=/opt/local/bin:/opt/local/sbin:$PATH
# Finished adapting your PATH environment variable for use with MacPorts.
# Add colors to terminal
export CLICOLOR=1
export LSCOLORS=ExFxBxDxCxegedabagacad

# added by Anaconda 1.6.1 installer
export PATH="//anaconda/bin:$PATH"
export PATH=/anaconda//bin/isympy:$PATH

# added to Homebrew: bad command
export PATH=/usr/local/bin:$PATH

Update: I updated anaconda and ipython using conda update as suggested, but still get the same error message.

Update 2: Thanks for all the suggestions. I modified /usr/local/bin/ipython as follows:

#!//anaconda/bin/python
# EASY-INSTALL-ENTRY-SCRIPT: 'ipython==1.1.0','console_scripts','ipython'
__requires__ = 'ipython==1.1.0'
import sys
from pkg_resources import load_entry_point

sys.exit(
   load_entry_point('ipython==1.1.0', 'console_scripts', 'ipython')()
)

Now which ipython produces //anaconda/bin/ipython, and ipython launches.

Answer 1

Your problem is in your $PATH. If you look at your traceback, it's running /usr/local/bin/ipython - this is the one that is installed by Homebrew, and not by Anaconda. (Anaconda installs everything into /anaconda/bin.)

The reason this is getting picked up is because the very last line of your .bash_profile sticks /usr/local/bin at the front of your path. This means that the ipython that you installed via Homebrew is masking the one that's installed by Anaconda.

You have two options:

1. Uninstall the ipython that Homebrew installed, and just use Anaconda for your Python packages.

2. In your .bash_profile, move the Homebrew PATH modification line above the Anaconda one. This way, Anaconda's ipython, python, and various other Python commands will take precedence.

Remember, if you change your .bash_profile, you need to close your Terminal and start a new one for the changes to take effect.