We’ve fixed an issue in our custom Java Runtime Environment for older versions of PyCharm. If you’re using PyCharm 2017.3 or PyCharm 2018.1, please update to the new version.
Fixed in These Versions
Keyboard issues in macOS Mojave
After typing a special character by pressing and holding a key, the IDE would not accept any other input after inserting the special character. This has now been resolved.