Installed Python 3 on Mac OS X Yosemite but its still Python 2.7

[James Dekker]

I am currently running OS X Yosemite (10.10.2) on my MacBook Pro... By
default, Apple ships Python 2.7.6 on Yosemite.

Just downloaded and ran this installer for Python 3:

python-3.4.3-macosx10.6.pkg

When I opened up my Terminal and typed in python, this is what came up:

Python 2.7.6 (default, Sep  9 2014, 15:04:36) [GCC 4.2.1 Compatible
Apple LLVM 6.0 (clang-600.0.39)] on darwinType "help", "copyright",
"credits" or "license" for more information.>>>

Sorry, I am very new to Python...

Question(s):

(1) Does anyone know where the Python 3.4.3 interpreter was installed?

(2) Do I need to uninstall Python 2.7.3 (if so, how do I go about doing
this) before setting a global environmental variable such as PYTHON_HOME to
the location of the installed Python 3.4.3?

Thank for taking the time to read this...
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