PyCharm can sometimes get confused specially if you have multiple interpreters and using virtualenv. To fix "Unresolved reference 'print'" message, do File | Setting... (Ctrl+Alt+S) | Project Interpreter | Show All (drop down) | Show path for the selected interpreter () | Reload List of Paths ().
Reference(s):
http://forum.jetbrains.com/thread/PyCharm-291
Reference(s):
http://forum.jetbrains.com/thread/PyCharm-291
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