Solution 1
Goto File -> Settings
Then
Preferences->Project Interpreter->Python Interpreters
Solution 2
Want have some projects run with Python 2 and some projects running with Python 3 ?
Check under Run > Edit Configurations
Solution 3
In above PyCharm 2019.1+, you can try a new feature called Interpreter in status bar
Enable status bar
You can easily activate pycharm status bar by running the Find Action command (Ctrl+Shift+A or ⌘+ ⇧+A on mac). input status bar and choose View: Status Bar to see it
