HackerDavid Beazley - Lambda Calculus from the Ground Up - PyCon 2019
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Beazley 用函数模拟条件分支时撞见了求值顺序。Python 调用普通函数前会先求出两个参数，于是本该跳过的递归也启动了。把分支包装成稍后才调用的函数，就能只运行被选中的那边。
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it goes down both paths. And it turns out that the second path just explodes in infinite recursionyou're basically delaying the calculation to some later point in time