As you read in the title above; to update your python packages via pip:
for Linux/*nix:
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pip freeze --local | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip install -U |
p/s: you may need to run as sudo. Probably.
for Windows:
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for /F "delims===" %i in ('pip freeze -l') do pip install -U %i |
Credit: http://stackoverflow.com/questions/2720014/upgrading-all-packages-with-pip