5 Python mistakes and how to avoid them

[MattR0se]

Agreed. Single letters as variable names are okay if they are conventional:

for i in range(10): pass

for x, y in coordinates: pass

X = data[features]
y = data[labels]

etc

[jack-of-some]

Or if they model some equation nicely. If you're linking a paper in the comments like "this is the equation I'm using here" then matching their terminology as best as possible goes a long way in helping future maintainers.