PyCharm shows unresolved references error for valid code

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Track title: Lost Meadow

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Chapters
00:00 Question
00:53 Accepted answer (Score 499)
01:06 Answer 2 (Score 151)
01:45 Answer 3 (Score 86)
04:38 Answer 4 (Score 32)
05:01 Thank you

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Full question
https://stackoverflow.com/questions/1172...

Answer 2 links:
https://intellij-support.jetbrains.com/h...

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Tags
#python #pycharm

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