python3-pyqt5.qsci 2.10.4+dfsg-1build1 (amd64 binary) in ubuntu cosmic

 QScintilla is a text editor for Qt5 with features especially useful when
 writing and debugging source code. These include support for syntax
 styling, error indicators, code completion, call tips and margins.
 .
 This package contains Python 3 bindings so QScintilla 2 can be used in
 PyQt5 applications.