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<section id="numpy-char-capitalize">
<h1>numpy.char.capitalize<a class="headerlink" href="#numpy-char-capitalize" title="Link to this heading">#</a></h1>
<dl class="py function">
<dt class="sig sig-object py" id="numpy.char.capitalize">
<span class="sig-prename descclassname"><span class="pre">char.</span></span><span class="sig-name descname"><span class="pre">capitalize</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">a</span></span></em><span class="sig-paren">)</span><a class="reference external" href="https://github.com/numpy/numpy/blob/main/numpy/_core/strings.py#L1194-L1232"><span class="viewcode-link"><span class="pre">[source]</span></span></a><a class="headerlink" href="#numpy.char.capitalize" title="Link to this definition">#</a></dt>
<dd><p>Return a copy of <code class="docutils literal notranslate"><span class="pre">a</span></code> with only the first character of each element
capitalized.</p>
<p>Calls <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str.capitalize" title="(in Python v3.13)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">str.capitalize</span></code></a> element-wise.</p>
<p>For byte strings, this method is locale-dependent.</p>
<dl class="field-list">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><dl>
<dt><strong>a</strong><span class="classifier">array-like, with <code class="docutils literal notranslate"><span class="pre">StringDType</span></code>, <code class="docutils literal notranslate"><span class="pre">bytes_</span></code>, or <code class="docutils literal notranslate"><span class="pre">str_</span></code> dtype</span></dt><dd><p>Input array of strings to capitalize.</p>
</dd>
</dl>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><dl class="simple">
<dt><strong>out</strong><span class="classifier">ndarray</span></dt><dd><p>Output array of <code class="docutils literal notranslate"><span class="pre">StringDType</span></code>, <code class="docutils literal notranslate"><span class="pre">bytes_</span></code> or <code class="docutils literal notranslate"><span class="pre">str_</span></code> dtype,
depending on input types</p>
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<p class="admonition-title">See also</p>
<dl class="simple">
<dt><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str.capitalize" title="(in Python v3.13)"><code class="xref py py-obj docutils literal notranslate"><span class="pre">str.capitalize</span></code></a></dt><dd></dd>
</dl>
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<p class="rubric">Examples</p>
<div class="try_examples_outer_container docutils container" id="6c6f6d11-d17f-4a24-a53b-aff21d3304d4">
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<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">numpy</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="nn">np</span>
<span class="gp">>>> </span><span class="n">c</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="s1">'a1b2'</span><span class="p">,</span><span class="s1">'1b2a'</span><span class="p">,</span><span class="s1">'b2a1'</span><span class="p">,</span><span class="s1">'2a1b'</span><span class="p">],</span><span class="s1">'S4'</span><span class="p">);</span> <span class="n">c</span>
<span class="go">array(['a1b2', '1b2a', 'b2a1', '2a1b'],</span>
<span class="go"> dtype='|S4')</span>
<span class="gp">>>> </span><span class="n">np</span><span class="o">.</span><span class="n">strings</span><span class="o">.</span><span class="n">capitalize</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="go">array(['A1b2', '1b2a', 'B2a1', '2a1b'],</span>
<span class="go"> dtype='|S4')</span>
</pre></div>
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