回答編集履歴
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追記
test
CHANGED
@@ -261,3 +261,171 @@
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遠回りしている感が否めませんが、NamedZipは少し使いやすそう。
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コメントを受けて
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---
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> 簡単な説明をコードに付け加えていただけると助かります。
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デバッグプリントだけ加えておきました。
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```Python
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import collections
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import itertools
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def gen_fibonacci_n(n: int):
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sequence = collections.deque(
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itertools.repeat(0, n-1)
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)
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sequence.append(1)
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total = 1
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while True:
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print(sequence)
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yield sequence[0]
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sequence.append(total)
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total = 2 * total - sequence.popleft()
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print('{:-^20s}'.format('fibonacci'))
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gen_fib = gen_fibonacci_n(2)
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for e in itertools.islice(gen_fib, 10):
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print(e)
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print('{:-^20s}'.format('tribonacci'))
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gen_trib = gen_fibonacci_n(3)
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for e in itertools.islice(gen_trib, 10):
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print(e)
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```
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**実行結果** [Wandbox](https://wandbox.org/permlink/MNfMl7dScwcqGqGm)
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```plain
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-----fibonacci------
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deque([0, 1])
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0
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deque([1, 1])
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1
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deque([1, 2])
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1
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deque([2, 3])
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2
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deque([3, 5])
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3
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deque([5, 8])
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5
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deque([8, 13])
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8
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deque([13, 21])
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13
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deque([21, 34])
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21
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deque([34, 55])
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34
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-----tribonacci-----
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deque([0, 0, 1])
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0
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deque([0, 1, 1])
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0
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deque([1, 1, 2])
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1
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deque([1, 2, 4])
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1
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deque([2, 4, 7])
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deque([4, 7, 13])
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deque([7, 13, 24])
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deque([13, 24, 44])
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13
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deque([24, 44, 81])
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deque([44, 81, 149])
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44
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```
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dequeをn長のキューとして利用しています。
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追記
test
CHANGED
@@ -11,3 +11,253 @@
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lst = [fib, trib, ..., dod]
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```
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追記
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---
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関数fib, trib, tetrなどの計算量が気になります。
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[functools.lru_cache](https://docs.python.org/ja/3/library/functools.html#functools.lru_cache)を利用するか、ジェネレータ関数として実装し直すことをお勧めします。
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ランダムアクセスが必須なら前者、シーケンシャルアクセスで良いなら後者が良いでしょう。
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書いてみた
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---
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面白そうだったので、個人的な趣味全開で書いてみました。
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**main.py**
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```Python
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from fibonacci import gen_fibonacci_n
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from namedzip import NamedZip
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func_dct = dict(zip(
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['fib', 'trib', 'tetr'], map(gen_fibonacci_n, [2, 3, 4])
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))
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it = enumerate(NamedZip(**func_dct), start=1)
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for count, dct in it:
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print('{:-^20s}'.format(f' count: {count:2d} '))
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for name, val in dct.items():
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print('{:6s} {:3d}'.format(f'{name}:', val))
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print()
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#
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if dct['fib'] < dct['trib']:
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break
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```
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**fibonacci.py**
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```Python
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import collections
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import itertools
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def gen_fibonacci_n(n: int):
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sequence = collections.deque(
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itertools.repeat(0, n-1)
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)
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sequence.append(1)
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total = 1
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while True:
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yield sequence[0]
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sequence.append(total)
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total = 2 * total - sequence.popleft()
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```
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**namedzip.py**
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```Python
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class NamedZip:
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def __init__(self, dct=None, **kwards):
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if dct:
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kwards = {**dct, **kwards}
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self._names = kwards.keys()
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self._iters = [
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iter(val) for val in kwards.values()
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]
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def __iter__(self):
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return self
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def __next__(self):
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return dict(zip(
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self._names, [next(it) for it in self._iters]
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))
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```
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**実行結果** [Wandbox](https://wandbox.org/permlink/RVoweZzHW35MlIQP)
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```plain
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---- count: 1 -----
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fib: 0
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trib: 0
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tetr: 0
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---- count: 2 -----
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fib: 1
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trib: 0
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tetr: 0
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---- count: 3 -----
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fib: 1
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trib: 1
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tetr: 0
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---- count: 4 -----
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fib: 2
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trib: 1
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tetr: 1
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---- count: 5 -----
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fib: 3
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trib: 2
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tetr: 1
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---- count: 6 -----
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fib: 5
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trib: 4
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tetr: 2
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---- count: 7 -----
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fib: 8
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trib: 7
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tetr: 4
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---- count: 8 -----
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fib: 13
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trib: 13
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tetr: 8
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---- count: 9 -----
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fib: 21
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trib: 24
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tetr: 15
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```
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262
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+
|
263
|
+
遠回りしている感が否めませんが、NamedZipは少し使いやすそう。
|