$ cat writeup.md…
$ cat writeup.md…
kalmarctf
Task: Python eval jail with 72-char limit, no dunders, no whitespace, AST-level ban on iter/gen/comprehension. Solution: yield-in-lambda creates a generator without triggering AST filter, walrus operator + gi_frame chain recovers real builtins, help() opens interactive mode, IPython.__main__ import gives full REPL.
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