[issue22385] Define a binary output formatting mini-language for *.hex()

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Given that we have f-strings, I don't think a format mini language makes as much sense.  My PR adds support for separators to the .hex() methods (and to binascii.hexlify) via a parameter.  Extending beyond what MicroPython already does in its binascii implementation (a single sep parameter).

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<https://bugs.python.org/issue22385>
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