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升级

• pip install --upgrade setuptools
• pip install --upgrade pip

lxml install failed

• http://stackoverflow.com/questions/19548011/cannot-install-lxml-on-mac-os-x-10-9

手册

• http://lesliezhu.github.io/public/2014-11-08-pip.html

upgrade all packages

• http://mikegrouchy.com/blog/2014/06/pro-tip-pip-upgrade-all-python-packages.html
• http://stackoverflow.com/questions/2720014/upgrading-all-packages-with-pip