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+## Теория
+
+База:
+- Байткод для `LOAD_FAST` и прочего: https://docs.python.org/3/library/dis.html#opcode-LOAD_FAST
+- `LOAD_CLOSURE:` https://docs.python.org/3/library/dis.html#opcode-LOAD_CLOSURE
+- `UnboundLocalError`: https://docs.python.org/3/library/exceptions.html#UnboundLocalError
+- Rules for `global` and `local` variables: https://docs.python.org/3/faq/programming.html#what-are-the-rules-for-local-and-global-variables-in-python
+- `locals`: https://docs.python.org/3/library/functions.html#locals
+- `globals`: https://docs.python.org/3/library/functions.html#globals
+- `Cell` objects: https://docs.python.org/3/c-api/cell.html
+- Константы в Python: https://sobolevn.me/2018/07/real-python-contants
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