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I just spend two days chasing a bug because someone shoved a variable inside a dataclass in the wrong place, nothing is immutable in python.

• iainmerrick 6y ago
  No, strings are immutable, despite the semantic gymnastics this article is performing.
  • masklinn 6y ago
    Strings are immutable on the Python side. On the C size, however, PyUnicode_Resize is part of the PEP 384 Stable ABI and very specifically tries to resize the string in-place (it's normally intended for string-building).
    • ymbeld 6y ago
      If it is immutable from the client’s perspective, it’s immutable. Anything else is ill-defined.
      • masklinn 6y ago
        The C api is “from a client’s perspective”. Any rando can build native modules with it.
        • ymbeld 6y ago
          I stand corrected.
• mcv 6y ago
  In javascript I enforce immutability by hitting people over the head when they try to mutate something they're not supposed to.