it has always been best practice to not modify the system's python.  
however, to do that strictly would mean that you must do one of these:

* use python's virtualenv
* install your own version of python, completely separately from the system 
python
* install extensions to the system python using the --user option to 'pip 
install'

none of those are particularly user-friendly.

since weewx has minimal requirements, the docs use instructions that result 
in modification of the system's python installation.  typically that mean 
'sudo pip install xxx'.  but on some systems you would have to first 
install pip, or you would have to use easy_install.

i think we can continue this pattern - use the system's python - instead of 
complicating things for weewx users.  but only if we can keep the weewx 
dependencies to a minimum.

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