Question: how to comment and uncomment multiple lines in pycharm?
Answer: ctrl+[SPACE] Complete code. shift+ctrl+/ Comment/uncomment code with block comments. ctrl+/ Comment/uncomment current line or selected block with line comments. shift+ctrl+↵ Complete Current Statement. ctrl+I. ...  ctrl+O. ...  ctrl+P. ...  Surround selected code fragment with if, while, try/catch or other construct.