Recently updated 2018.3-Pycharm was reported as an exception when I was writing the code, so I plan to reduce the version. Looking for no relevant uninstall document on the Internet, I will simply share my uninstall process. If there is any error, please correct it in the comments section.
1. Open visit, find PyCharm application, and right-click it and move it to the wastepaper basket;
2. Clear the cache, parameters and log-related configuration files (note: PyCharm2018.3 is the name of my file)

      a、cd ~/Library/Preferences/           

            rm -rf PyCharm2018.3/         

      b、cd ~/Library/Logs

           rm -rf PyCharm2018.3/

      c、cd ~/Library/Application\ Support/

           rm -rf PyCharm2018.3/

      d、cd ~/Library/Caches/

           rm -rf PyCharm2018.3/

The above two steps completely uninstall clean, the following on their own to find the low version of installation can.