Only Ascii characters accepted about bullet HOT 3 OPEN

str.startswith optionally takes a tuple of strings to try. Better to write the above as not any(repr(ch).startswith(("'\\x", "'\\u")) for ch in s)

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A response to the stackoverflow post, Test if a python string is printable, provides a clever way to check for non-printable characters:

def is_printable(s):
    return not any(repr(ch).startswith("'\\x") or repr(ch).startswith("'\\u") for ch in s)

Replacing the check in utils.py to use this function would allow any utf-8 printable input to be used:

if is_printable(c):
    return c
else:
    return UNDEFINED_KEY

I'll create a PR with this change, hopefully it will be accepted since allowing utf-8 input should be a requirement (IMO).

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I had no idea that you could provide a tuple to startswith, thank you for pointing that out! The updated version will be in the PR.

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