Created
September 19, 2019 03:55
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List monad (+alternative) for nondeterminism in Python
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| toss = {"Fair": ["Heads", "Tails"], "Biased": ["Heads", "Heads"]} | |
| @do | |
| def coins(): | |
| coin = yield ["Fair", "Biased"] | |
| result = yield toss[coin] | |
| _ = yield guard(result == "Heads") | |
| return coin | |
| # Probability of a biased coin, given you observed Heads, is 2/3. | |
| assert coins() == ["Fair", "Biased", "Biased"] |
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