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Switching an environment from Python 2 to Python 3
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The command ``conda update`` moves up to the latest compatible version, while ``conda install`` can install any version. 

EXAMPLE: If Python 2.7.7 is currently installed, but the latest version of Python 2 is 2.7.12 and the latest version of Python 3 is 3.5.2, then ``conda update python`` installs Python 2.7.12, while ``conda install python=3`` installs Python 3.5.2. 

Conda uses the same rules for other packages, so ``conda install`` always installs the highest version, and ``conda update`` always installs the highest version with the same major version number.
