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Here is an example involving the unicode character MIDDLE DOT · : The line
ab·cd = 7
is valid Python 3 code and is happily accepted by the CPython interpreter. However, tokenize.py does not like it. It says that the middle-dot is an error token. Here is an example you can run to see that:
 import tokenize
 from io import BytesIO
 
 test = 'ab·cd = 7'.encode('utf-8')
 
 x = tokenize.tokenize(BytesIO(test).readline)
 for i in x: print(i)
For reference, the official definition of identifiers is: 
https://docs.python.org/3.6/reference/lexical_analysis.html#identifiers
and details about MIDDLE DOT are at
https://www.unicode.org/Public/10.0.0/ucd/PropList.txt
MIDDLE DOT has the "Other_ID_Continue" property, so I think the interpreter is behaving correctly (i.e. consistent with the documented spec), while tokenize.py is wrong.