Switch the pycharm compiler python3.6 and 3.7 back and forth according to different compilation environments

Problem Description:

Anaconda's python environment is python3.7, but the downloaded project requires python3.6.

solution:

Install both python3.6 and python3.7. (For example, install python3.6 on the basis of python3.7) 1. Download python3.6.6
on the official website https://www.python.org/downloads/windows/ , and open it to run after the download is complete.

2.pycharm adds a virtual interpreter.
1).File->settings

2).Open the current project in the settings interface.

3). Select the interpreter

4) Select show all to add the environment you need.

5) Plus sign.

6) The installation path of python3.6.

7)！