Importing code files with unicode using listings

Question

I've written a program in python, about 2500 lines in total, that I wish to include segments from into my report. Normally I use listings to do that but in this case, the .py files include many unicode characters which are necessary for the understanding of the files.

These characters, e.g. ⇒, cause these errors in latex

! Package inputenc Error: Unicode char �\lst@FillFixed@ (U+5B4) (inputenc) not set up for use with LaTeX.
! Package inputenc Error: Keyboard character used is undefined (inputenc) in inputencoding `utf8'.

MWE:

\documentclass[a4paper, 11pt]{report}

\usepackage[utf8]{inputenc} 
\usepackage[english]{babel} % English language/hyphenation
\usepackage{xcolor}
\usepackage{listings}
\usepackage[T1]{fontenc}

\begin{document}
\chapter{Fists Chapter}
Some text
\lstinputlisting[language=Python, inputencoding=utf8, extendedchars=true]{code.py}
\end{document}

.py file

def Code(self):
    print("Some code with comments"):
    # Comments with unicode characters 
    # β∠ζπ⇒