How to Fix the IPython Notebook 'ValueError: unknown locale: UTF-8' Error on macOS?

IPython Notebook Locale Error

When attempting to launch the IPython Notebook after installing Anaconda Python for Mac OSX, an error may arise:

ValueError: unknown locale: UTF-8

This issue stems from a locale mismatch between the system settings and the IPython Notebook. To resolve the problem, one needs to set the locale environment variables to match the system's preferred locale.

Solution:

1. Identify the preferred locale using the locale command:

   locale

   This will display the current locale settings.

2. Set the LC_ALL and LANG environment variables to match the system locale, for example, for a Swiss French locale:

   export LC_ALL=fr_CH.UTF-8
   export LANG=fr_CH.UTF-8

3. Reload the environment variables:

   source ~/.bash_profile

4. Restart IPython Notebook:

   ipython notebook

Alternatively, one can set the locale variables directly in the Anaconda Python environment:

ipython --env LC_ALL=fr_CH.UTF-8 notebook

By setting the locale environment variables accordingly, the IPython Notebook will be able to operate with the correct locale, resolving the ValueError.

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