<h2 id="dataframe">
<a class="header-anchor-link" href="#dataframe" aria-hidden="true"></a> DataFrame</h2>
<h3 id="shape">
<a class="header-anchor-link" href="#shape" aria-hidden="true"></a> shape</h3>
<p>行と列のサイズを取得</p>
<div class="code-block-container"><pre class="language-python"><code class="language-python">df<span class="token punctuation">.</span>shape
<span class="token comment"># 例）(10, 5)　→10行×5列</span>

<span class="token comment"># 行のみ、列のみのサイズも取得可能</span>
df<span class="token punctuation">.</span>shape<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span> <span class="token comment"># 行</span>
df<span class="token punctuation">.</span>shape<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span> <span class="token comment"># 列</span>
</code></pre></div><h3 id="len()">
<a class="header-anchor-link" href="#len()" aria-hidden="true"></a> len()</h3>
<p>Python組み込み関数ののlen()を使用してサイズを取得</p>
<div class="code-block-container"><pre class="language-python"><code class="language-python"><span class="token comment"># 行数</span>
<span class="token builtin">len</span><span class="token punctuation">(</span>df<span class="token punctuation">)</span>
<span class="token comment"># 以下も同じ</span>
<span class="token builtin">len</span><span class="token punctuation">(</span>df<span class="token punctuation">.</span>index<span class="token punctuation">)</span>

<span class="token comment"># 列数</span>
<span class="token builtin">len</span><span class="token punctuation">(</span>df<span class="token punctuation">.</span>columns<span class="token punctuation">)</span>
</code></pre></div><h3 id="size">
<a class="header-anchor-link" href="#size" aria-hidden="true"></a> size</h3>
<div class="code-block-container"><pre class="language-python"><code class="language-python"><span class="token comment"># 全要素数（行数×列数の値）</span>
df<span class="token punctuation">.</span>size
</code></pre></div><h3 id="series">
<a class="header-anchor-link" href="#series" aria-hidden="true"></a> Series</h3>
<p>Seriesは1次元のデータなので以下すべて同じ</p>
<div class="code-block-container"><pre class="language-python"><code class="language-python">sr<span class="token punctuation">.</span>shape
<span class="token builtin">len</span><span class="token punctuation">(</span>sr<span class="token punctuation">)</span>
sr<span class="token punctuation">.</span>size
</code></pre></div>

【Python】DataFrame/Seriesのサイズを取得

DataFrame

shape

len()

size

Series

Discussion