python3-pyqt4.qsci-dbg 2.9.1+dfsg-2 (arm64 binary) in ubuntu xenial

 QScintilla is a text editor for Qt4 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 the extensions built for the Python 3 debug
 interpreter.