A hard exercise to help build the right mental model for Python data.
- Solution: https://memory-graph.com/#codeurl=https%3A%2F%2Fraw.githubusercontent.com%2Fbterwijn%2Fmemory_graph_videos%2Frefs%2Fheads%2Fmain%2Fexercises%2Fexercise26.py&play=
- Explanation: https://github.com/bterwijn/memory_graph?tab=readme-ov-file#python-data-model
The “Solution” link visualizes execution and reveals what’s actually happening using 𝗺𝗲𝗺𝗼𝗿𝘆_𝗴𝗿𝗮𝗽𝗵: https://github.com/bterwijn/memory_graph
Not too familiar with the union operator for dicts, but that result was not what I expected.
The dict union operator is similar to that of set, but in addition the right operand overwrites values of keys of the left operand. It’s a nice operator once you get used to it.
Easy to make a mistake with this exercise:
b = b | {3: []}makes a shallow copy2inaso we can still append to that and changea