This is an update with a much better solution than my previous answer (which I completely missed that OP was asking for a solution that didn't require exactly what I suggested).
Like Carl commented above, updating python-skeletons is actually the way to go, however, if you're using Cygwin, the interpreter paths are a little wonky, and PyCharm won't always automatically add the right paths. For me, PyCharm handled it just fine in version 4.5.4, but not 5.0.4.
You'll find the python builtins in your Pycharm config directory, probably at:
C:\Users\[USERNAME]\.PyCharm50\system\python_stubs\-[RANDOM_STRING_OF_NUMBERS]
Just manually add this path (or paths) to your interpreter and it should resolve your problem. You can do the same for your site-packages folder if that's currently polluting your project structure space.
To get to the right menu:
- Click File -> Settings
- Navigate to Project -> Project Interpreter
- Click the gear on the top right and click "More"
- Select your interpreter and click the "Show paths" button on the right
- Instead of clicking refresh, as many other posts suggest, click the "Add" button on the right and add your paths
There's a handy screenshot uploaded by r---------k on the updating python-skeletons post that if that helps you.
Try installing the Python package for Windows from
http://www.python.org/download/windows and point PyCharm to that
interpreter instead.
Settings -> Project -> Project Interpreter -> Gear -> Add Local
You may also need to install PyCharm's Python packaging tools (you
should see a link on the bottom of the Project Interpreter page if it
isn't installed already).
While this may not be a perfect solution depending on your workflow
because PyCharm will no longer be using Cygwin's python interpreter,
but this at least got rid of those pesky squiggly red underlines for
me.
