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>>> token_bytes(16) #doctest:+SKIP
b'\xebr\x17D*t\xae\xd4\xe3S\xb6\xe2\xebP1\x8b'
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hex digits. If *nbytes* is ``None`` or not supplied, a reasonable
default is used.
>>> token_hex(16) #doctest:+SKIP
'f9bf78b9a18ce6d46a0cd2b0b86df9da'
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or not supplied, a reasonable default is used.
>>> token_urlsafe(16) #doctest:+SKIP
'Drmhze6EPcv0fN_81Bj-nA'
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