4 ms·

That doesn't explain why upper lower conversion shouldn't round trip within one locale.

• duckerude 8y ago
  As an example, the Greek letter sigma has two lowercase forms, depending on whether it's at the end of a word. So 'ς'.upper().lower() == 'σ', even though all three characters are ordinary Greek letters you could even find within a single word.
  • princekolt 8y ago
    adds to personal notes: Never accept a job that involves manually dealing with locales
    • rspeer 8y ago
      Good note, but the fact that ς doesn't round trip isn't locale-dependent.
  • tedunangst 8y ago
    Thanks. That's a much better example.