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コードは簡単ですが、全て教えてしまうと勉強にならないので、自分でやってみて分からなければまた質問してください。
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わからないということなので、サンプルを書いておきます。
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これを元にして、考えてください。
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```python
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>>> def read_words(filename):
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... with open(filename, 'r', encoding='utf_8') as file:
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... words = [line.strip().split('\t') for line in file.readlines()]
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... return words
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...
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>>> def select_word(words, letter):
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... return [word for word in words if word[0].startswith(letter)]
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...
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>>> first_letter = 'b'
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>>> all_words = read_words("文字列読込2ab.txt")
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>>> selected_words = select_word(all_words, first_letter)
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>>> print('selected_words:', selected_words)
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selected_words: [['bedlam', '不穏な騒ぎ、混乱、気違いざた〔差別語〕', 'Stay away from their bedlam. あの人達に関わるな。'], ['behest', '(古)命令、依頼', 'at his behest 彼の命令・要請で']]
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>>> print('selected_words[0]:', selected_words[0])
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selected_words[0]: ['bedlam', '不穏な騒ぎ、混乱、気違いざた〔差別語〕', 'Stay away from their bedlam. あの人達に関わるな。']
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>>> print('selected_words[0][0]:', selected_words[0][0])
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selected_words[0][0]: bedlam
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>>> print('selected_words[0][1]:', selected_words[0][1])
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selected_words[0][1]: 不穏な騒ぎ、混乱、気違いざた〔差別語〕
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>>> print('selected_words[0][2]:', selected_words[0][2])
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selected_words[0][2]: Stay away from their bedlam. あの人達に関わるな。
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```
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