May not be news to many but it was welcome news to me--PyCharm has two tools available on the Edit/Find menu tree that I have found (only recently) to be hugely invaluable.
Find in Path
Replace in Path
Select the base path item in the project pane and then these tools allow searches/replaces to be done across the whole project. They are a big time saver.
I came here to drink milk and kick ass....and I've just finished my milk.