Lots of duplicate entries in the autocomplete
Answered

How can clean up it? Thanks!
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Unfortunately, it's a known problem https://youtrack.jetbrains.com/issue/PY-17810, please follow it for updates. See https://intellij-support.jetbrains.com/hc/en-us/articles/207241135-How-to-follow-YouTrack-issues-and-receive-notifications if you are not familiar with YouTrack.