[Python-Dev] Re: Making mutable objects readonly
Barry A. Warsaw
Mon, 29 Jan 2001 23:26:50 -0500
>>>>> "ESR" == Eric S Raymond <email@example.com> writes:
ESR> Fortunately, there's a semantics that captures both. If we
ESR> allow freeze to take an optional key argument, and require
ESR> that an unfreeze call must supply the same key or fail, we
ESR> get both worlds. We can even one-way-hash the keys so they
ESR> don't have to be stored in the bytecode.
ESR> Want to lock a structure permanently? Pick a random long
ESR> key. Freeze with it. Then throw that key away...