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Adding recursive generators section #53

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b089608
Adding recursive generators using the "yield from" statment
Apr 12, 2020
52b40ea
Typo correct
Apr 12, 2020
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17 changes: 17 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -238,7 +238,24 @@ def count(start, step):
>>> next(counter), next(counter), next(counter)
(10, 12, 14)
```
### Recursive generator
* **Generators can be recursive using the yield from statement.**

```python
def depth_first(trie, current_word = ''):
if trie is None:
yield current_word
else:
for letter, new_trie in trie.items():
yield from depth_first(new_trie, current_word + letter)
```

```python
>>> trie={'b': {'a': {'b': {'y': None}, 'd': None,'n': {'k': None}}, 'o': {'x': None}},
... 't': {'e': {'a': None,'d': None,'n': None}, 'o': None}}
>>> [w for w in depth_first(trie)]
['baby', 'bad', 'bank', 'box', 'tea', 'ted', 'ten', 'to']
```

Type
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