回答編集履歴
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追記
test
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@@ -9,3 +9,91 @@
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テキスト形式に拘らなければ、バイナリで出力するのが効率的でしょう。
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書いてみた
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---
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```Python
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from pathlib import Path
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import pickle
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FILE_PATH = Path(__file__).parent / 'words.pkl'
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def main():
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#
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if FILE_PATH.exists():
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with FILE_PATH.open(mode='rb') as f:
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words = pickle.load(f)
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else:
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words = set()
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#
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while True:
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try:
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word = input('>>> ')
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except EOFError:
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break
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if word in words:
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print('already exists.')
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else:
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words.add(word)
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#
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with FILE_PATH.open(mode='wb') as f:
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pickle.dump(words, f)
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if __name__ == '__main__':
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main()
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```
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なお、pklファイルの中身はpickleモジュールを直接叩けば覗けます。
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```cmd
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>python -m pickle words.pkl
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{'', 'hoge', 'aweff', 'fuu', 'foo', 'fuga', 'hgoe'}
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```
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