When you run PyCharm with Python 2.7.2, you may see errors for @staticmethod annotations. PyCharm marks your @staticmethod annotation as an error:
When you mouse over, you see a failing the unresolved reference inspection:
You can fix this issue by configuring Python 2.7.6 as the Project Interpreter:
To configure your Python Interpreter, select: PyCharm > Preferences… > Project: your_project > Project Interpreter. You may have to install 2.7.6 or a newer version, for example, by clicking “+” in the OS X version of PyCharm. Once you configure 2.7.6 PyCharm will update your indexes and, once that process completes, you will see a clean @staticmethod annotation:
1 Bit Entropy 