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In general these sort of discussions are not helped by the imprecise terminology used by Scintilla (inherited from long ago Windows where it was first developed IIUC) and therefore by Geany, character and column.
A "character" approximately maps to a Unicode code point, but I am not gonna guarantee that nowhere in the Geany manual is "character" used where the writer meant "byte".
A "column" has never existed since ASCII 80x24 terminals. The concept does map to glyphs for ASCII, but not otherwise since glyphs are not the same width and so "columns" do not map toglyphs or characters when:
When typing English text for sure these are not needed every character, but even then CJK and combining characters are needed for names, for example the ö in the name of one of Geany's esteemed originators is made from lower case ASCII o and U+308, thats two "characters" for one "column".
A specific comment as well:
use "72" not 73 for PEP8
The use-case for line breaking is not code line length assurance, it does not know anything about Python (in the PEP8 case) or any other programming language, so it could easily generate illegal code when breaking at arbitrary places, and for a setting B the break happens when the Bth character is typed (or the Bth line character when reflowing which is just line breaking applied to a selection/paragraph). The use-case for line breaking (and reflow) is for human language text, where breaks are less semantic and breaking at spaces works for most Western languages at least.
The use-case for the long line is for indicating code that exceeds some "limit" without actually performing a break and causing chaos in the code, here a setting of N (eg 72) will allow N single width glyphs before the vertical line, and since code is usually edited monospaced it works ... so long as no comments or strings or identifiers have non-ASCII characters in them 😁. (yes Python and other languages even C++ and soon C gasp!! identifiers can be non-ASCII, think math Σx = sum(x))
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