python beginner 2026-11-17 结束

Run-length encoding

Write two functions:

  • encode(text) turns runs of the same character into count + character: "aaabcc" becomes "3a1b2c".
  • decode(data) reverses it: "3a1b2c" becomes "aaabcc". Counts can have several digits ("12x").

Acceptance criteria

  • decode(encode(s)) == s for any text without digits.
  • Empty input gives empty output.
  • The tests at the bottom print All tests passed.

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