Nick Coghlan added the comment:
Copying the amended proposal from that python-ideas thread into here:
Start with a leading base format character (chosen to be orthogonal to the
default format characters):
"h": lowercase hex
"H": uppercase hex
"A": ASCII (using "." for unprintable & extended ASCII)
format(b"xyz", "A") -> 'xyz'
format(b"xyz", "h") -> '78797a'
format(b"xyz", "H") -> '78797A'
Followed by a separator and "chunk size":
format(b"xyz", "h 1") -> '78 79 7a'
format(b"abcdwxyz", "h 4") -> '61626364 7778797a'
format(b"xyz", "h,1") -> '78,79,7a'
format(b"abcdwxyz", "h,4") -> '61626364,7778797a'
format(b"xyz", "h:1") -> '78:79:7a'
format(b"abcdwxyz", "h:4") -> '61626364:7778797a'
In the "h" and "H" cases, allow requesting a preceding "0x" on the chunks:
format(b"xyz", "h#") -> '0x78797a'
format(b"xyz", "h# 1") -> '0x78 0x79 0x7a'
format(b"abcdwxyz", "h# 4") -> '0x61626364 0x7778797a'
In the thread, I suggested the section before the format character would use
the standard string formatting rules (alignment, fill character, width,
precision), but I now think that would be ambiguous and confusing, and would be
better left as a post-processing step on the rendered text.
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<http://bugs.python.org/issue22385>
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