ease of typing: so regular quotes are better vs backticks (even with a prefix), F-prefix - better than $, requiring Shift
ease of learning: here letter-mnemonic seems easiest: so I-prefix for "interpolation" or E-prefix for "expression" or maybe V-prefix for "variable". Or maybe F for "formatted" is also fine?
ease of typing: so regular quotes are better vs backticks (even with a prefix), F-prefix - better than $, requiring Shift
ease of learning: here letter-mnemonic seems easiest: so I-prefix for "interpolation" or E-prefix for "expression" or maybe V-prefix for "variable". Or maybe F for "formatted" is also fine?
familiarity: so F-prefix due to Python?