Understanding Selection - Intro to Computer Science Udacity English Japanese

Understanding Selection - Intro to Computer ScienceYouTube↗ IA↗(long shot)
Education 32.7K views 6 likes 1 dislikes 23 Feb 2015

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So selecting sub-sequences from strings is a very useful thing, we're

文字列の部分列の選択はとても便利です

going to use it lots of times in many of the programs

プログラムを書く時に何度も使います

we write, so we're going to have one more quiz about this.

もう一度部分列の小テストをします

This one's going to be a little more abstract, so for this

今回のテストは少し抽象的です

one, you're given any string S, so S is a variable.

今回はどんな文字列sでも使用できます　sは変数です

It holds a value of any string, and the question is,

どんな文字列の値も含むことができます　では問題です

which of these are always equivalent to the string S, no matter what S was at the beginning? So here are the choices.

初めの時点でsが何であれ文字列sと常に等しいのはどれか？では選択肢です

We have S index colon. We have S concatenated with S index 0 colon negative 1 plus 1. We have S index 0 colon. We have S

s［：］でしょうかそれともs＋s［0：－1＋1］でしょうかあるいはs［0：］

index colon negative 1. And we have

S index colon 3 plus S 3 colon.

それともs［：3］＋s［3：］でしょうか

So your goal is to check all of the expressions

これらの式をすべてチェックし

here that have the same exact value as S, no matter what string S is initially. Feel free to try evaluating things in the Python Interpreter. Try to think about it without

文字列sが何であれ sと同じ値を持つ式を全部選んでください Pythonインタプリタを使う前に答えを考えてみてください

doing that first. But you're welcome to do experiments running code in the Python Interpreter to try and answer this. For

Pythonインタプリタでコードを試すのは自由です

remember, for your answer to be correct, it has to work for any string S, not just the one that you try.

正しい答えであるためにはどんな文字列sでも成立しないといけません

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