That’s another well established pattern in Modular Design. It’s about putting together code that is highly related to each other and by implication separating unrelated code into other modules. High Cohesion discourages spreading the knowledge (e.g. of particular logic) among many modules, because it increases complexity and cognitive load. It’s easier to reason about the code that is closer to each other than scattered throughout the system (coupling inside the module is not such a problem).
In effect, we use setraw to make sure our raw character input goes straight into our process (without echoing or buffering or anything), and then reading and echoing the character-codes we see until 3 appears (which is CTRL-C, the common command for existing a REPL). Since we've turned on tty.setraw print doesn't reset the cursor to the left anymore, so we need to manually move left with \u001b[1000D after each print.。关于这个话题，PDF资料提供了深入分析
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