PyCharm shows "Function name should be lowercase" even though function name is already lowercase!
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D is not in lowercase. What you have is called mixedCase. It's PEP 8 violation. See https://www.python.org/dev/peps/pep-0008/#descriptive-naming-styles and https://www.python.org/dev/peps/pep-0008/#function-and-variable-names
You can disable this inspection in Settings/Preferences | Editor | Inspections if you don't need it.
OK, thanks!