How to use pycharm to auto indent the select area by the template of the coding style

That action is called Reformat code. You can find it in Code menu, somewhere in the middle, or use the hotkey CTRL + Shift + L

The latest version of PyCharm uses CTRL + SHIFT + ALT + L in both Linux and Windows. Then from the reformat dialog box, choose what reformatting option you want to perform.

CTRL + Shift + L will reformat your code.