python extract_msg module -env-3.7 - .tokenize_rtf - invalid Syntax error

Question

getting syntax error in okenizeRTF python 3.7 . please advise

from .tokenize_rtf import tokenizeRTF

Error:

  File "C:\Users\vvv\Miniconda3\envs\env-py37\lib\site-packages\extract_msg\_rtf\tokenize_rtf.py", line 68
    while (nextChar:= reader.read(1)) != b'' and nextChar.isalpha():
                   ^
SyntaxError: invalid syntax

just 2 line

import extract_msg

msg=extract_msg.Message('testmessage.msg')