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‎README.md

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* **Use `'<S>.index'` to get collection of keys and `'<S>.index = <coll>'` to update them.**
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* **Only pass a list or Series to loc/iloc because `'obj[x, y]'` is converted to `'obj[(x, y)]'` and `'<S>.loc[key_1, key_2]'` is how you retrieve a value from a multi-indexed Series.**
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* **Pandas uses NumPy types like `'np.int64'`. Series is converted to `'float64'` if we assign np.nan to any item. Use `'<S>.astype(<str/type>)'` to get converted Series.**
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* **Series will silently overflow if you run `'pd.Series([100], dtype="int8") + 100'`!**
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* **Series will silently overflow if we run `'pd.Series([100], dtype="int8") + 100'`!**
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#### Series — Aggregate, Transform, Map:
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```python

‎index.html

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<li><strong>Use <code class="python hljs"><span class="hljs-string">'&lt;S&gt;.index'</span></code> to get collection of keys and <code class="python hljs"><span class="hljs-string">'&lt;S&gt;.index = &lt;coll&gt;'</span></code> to update them.</strong></li>
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<li><strong>Only pass a list or Series to loc/iloc because <code class="python hljs"><span class="hljs-string">'obj[x, y]'</span></code> is converted to <code class="python hljs"><span class="hljs-string">'obj[(x, y)]'</span></code> and <code class="python hljs"><span class="hljs-string">'&lt;S&gt;.loc[key_1, key_2]'</span></code> is how you retrieve a value from a multi-indexed Series.</strong></li>
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<li><strong>Pandas uses NumPy types like <code class="python hljs"><span class="hljs-string">'np.int64'</span></code>. Series is converted to <code class="python hljs"><span class="hljs-string">'float64'</span></code> if we assign np.nan to any item. Use <code class="python hljs"><span class="hljs-string">'&lt;S&gt;.astype(&lt;str/type&gt;)'</span></code> to get converted Series.</strong></li>
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<li><strong>Series will silently overflow if you run <code class="python hljs"><span class="hljs-string">'pd.Series([100], dtype="int8") + 100'</span></code>!</strong></li>
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<li><strong>Series will silently overflow if we run <code class="python hljs"><span class="hljs-string">'pd.Series([100], dtype="int8") + 100'</span></code>!</strong></li>
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</ul>
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<div><h4 id="seriesaggregatetransformmap">Series — Aggregate, Transform, Map:</h4><pre><code class="python language-python hljs">&lt;el&gt; = &lt;S&gt;.sum/max/mean/std/idxmax/count() <span class="hljs-comment"># Or: &lt;S&gt;.agg(lambda &lt;S&gt;: &lt;el&gt;)</span>
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&lt;S&gt; = &lt;S&gt;.rank/diff/cumsum/ffill/interpol…() <span class="hljs-comment"># Or: &lt;S&gt;.agg/transform(lambda &lt;S&gt;: &lt;S&gt;)</span>

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