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Cascades

The code behind the picture

Follow the lesson’s implementation, one code cell at a time.

Choose a language and read the cells in order. These are small teaching examples; the visual lesson runs separately.

Follow the calculation

Same inputs · Same operation · Same result

3 teaching cells · Python standard library · Read-only

1. Prepare the inputs
Use these small, explicit inputs to follow the calculation.
In [ ]:
```
import json

scores = [[0.9,0.8,0.7], [0.2,0.9,0.9], [0.9,0.1,0.8]]
threshold = 0.5
```

2. Stop at the first failed check

The scores and cutoffs are supplied for this example. Early exit gives the same survivors as evaluating every check, with fewer calls.

calls = 0
survivors = []
for index, checks in enumerate(scores):
    for score in checks:
        calls += 1
        if score < threshold:
            break
    else:
        survivors.append(index)
result = {"survivors": survivors, "calls": calls, "without_early_exit": 9}

3. Inspect the result
Print the result as JSON so both languages use the same output format.
In [ ]:
```
print(json.dumps(result))
```

Expected result

Running the three cells in order produces this result in either language.

{
  "survivors": [
    0
  ],
  "calls": 6,
  "without_early_exit": 9
}