Integrating exisiting Python Library to Anaconda
Question: I've been installing few Library/Toolkit for Python like NLTK, SciPy and NumPy
on my Ubuntu. I would like to try to use Anaconda distribution though. Should
I remove my existing libraries before installing Anaconda?


Answer: There is no need to remove your system Python. Anaconda sits alongside it.
When it installs, it adds a line to your `.bashrc` that adds the Anaconda
directory first in your `PATH`. This means that whenever you type `python` or
`ipython` in the terminal, it will use the Anaconda Python (and the Anaconda
Python will automatically use all the Anaconda Python libraries like numpy and
scipy rather than the system ones). You should leave the system Python alone,
as some system tools use it. The important points are:

  * Whichever Python is first on your `PATH` is what gets used when you use Python in the terminal. If you create a conda environment with `conda` and use `source activate` it will put that environment first on the `PATH`. 
  * Each Python (Anaconda or the system) will use its own libraries and not look at the others (this is not true if you set the `PYTHONPATH` environment variable, but I recommend that you don't).

