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print("NumPy array: \n {}".format(aaa)) |
python3
変数内の要素の数を数えるlen()
len(変数)
formatの代わりに%を使って小数点付きの数値を代入
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%d -> 整数で表示 %f -> 小数で表示 %.2f -> 小数第２位まで表示 %s -> 文字列として表示 |
（例）
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<span class="cm-variable">pai</span> = <span class="cm-number">3.141592</span> <span class="cm-builtin">print</span>(<span class="cm-string">"円周率は%f"</span> <span class="cm-operator">%</span> <span class="cm-variable">pai</span>) <span class="cm-comment"># 円周率は3.141592と出力されます。</span> <span class="cm-builtin">print</span>(<span class="cm-string">"円周率は%.2f"</span> <span class="cm-operator">%</span> <span class="cm-variable">pai</span>) <span class="cm-comment"># 円周率は3.14と出力されます。</span> |
formatの使い方
fruit = "banana"
color = "yellow"
print("{0}は{1}です".format("banana","yellow"))
指定文字を変数内に含む個数を出力する.count()
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<span class="cm-variable">city</span> = <span class="cm-string">"Tokyo"</span> <span class="cm-builtin">print</span>(<span class="cm-variable">city</span>.<span class="cm-property">count</span>(<span class="cm-string">"o"</span>)) <span class="cm-comment"># 2と出力されます。 リストの場合 (["山形","山梨","山口","山形","山梨","山口"],"山")</span> |
というのはできない、リストでは部分一致ではなく完全一致
sortedと.sort関数とメソッドは非破壊的と破壊的
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<span class="cm-variable">alphabet</span> = [<span class="cm-string">"a"</span>,<span class="cm-string">"d"</span>,<span class="cm-string">"e"</span>,<span class="cm-string">"c"</span>,<span class="cm-string">"b"</span>] <span class="cm-builtin">sorted</span>(<span class="cm-variable">alphabet</span>) <span class="cm-builtin">print</span>(<span class="cm-variable">alphabet</span>) |
adecbの順番で出力
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<span class="cm-variable">alphabet</span> = [<span class="cm-string">"a"</span>,<span class="cm-string">"d"</span>,<span class="cm-string">"e"</span>,<span class="cm-string">"c"</span>,<span class="cm-string">"b"</span>] <span class="cm-variable">alphabet</span>.<span class="cm-property">sort</span>() <span class="cm-builtin">print</span>(<span class="cm-variable">alphabet</span></code><code class="cm-s-ipython language-python">)</code><code class="cm-s-ipython language-python"> abcdeの順番で出力 |