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<section id="module-numpy.strings">
<span id="string-functionality"></span><span id="routines-strings"></span><h1>String functionality<a class="headerlink" href="#module-numpy.strings" title="Link to this heading">#</a></h1>
<p>The <a class="reference internal" href="#module-numpy.strings" title="numpy.strings"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.strings</span></code></a> module provides a set of universal functions operating
on arrays of type <a class="reference internal" href="arrays.scalars.html#numpy.str_" title="numpy.str_"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.str_</span></code></a> or <a class="reference internal" href="arrays.scalars.html#numpy.bytes_" title="numpy.bytes_"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.bytes_</span></code></a>.
For example,</p>
<div class="try_examples_outer_container docutils container" id="504d5ba3-8603-4bf0-b79b-8ffe53bf83ff">
<div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesShowIframe('504d5ba3-8603-4bf0-b79b-8ffe53bf83ff','8d0c119c-0c2d-4750-a096-0301c7398598','3609555e-b073-4b6d-92f4-d76eaba99076','../lite/tree/../notebooks/index.html?path=35c253b6_a65e_449f_8499_0f62151143ce.ipynb','None')">Try it in your browser!</button></div><div class="try_examples_content docutils container">
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></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">add</span><span class="p">([</span><span class="s2">"num"</span><span class="p">,</span> <span class="s2">"doc"</span><span class="p">],</span> <span class="p">[</span><span class="s2">"py"</span><span class="p">,</span> <span class="s2">"umentation"</span><span class="p">])</span>
<span class="go">array(['numpy', 'documentation'], dtype='<U13')</span>
</pre></div>
</div>
</div>
</div>
<div id="3609555e-b073-4b6d-92f4-d76eaba99076" class="try_examples_outer_iframe hidden"><div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesHideIframe('504d5ba3-8603-4bf0-b79b-8ffe53bf83ff','3609555e-b073-4b6d-92f4-d76eaba99076')">Go Back</button><button class="try_examples_button" onclick="window.openInNewTab('504d5ba3-8603-4bf0-b79b-8ffe53bf83ff','3609555e-b073-4b6d-92f4-d76eaba99076')">Open In Tab</button></div><div id="8d0c119c-0c2d-4750-a096-0301c7398598" class="jupyterlite_sphinx_iframe_container"></div></div><script>document.addEventListener("DOMContentLoaded", function() {window.loadTryExamplesConfig("../try_examples.json");});</script><p>These universal functions are also used in <a class="reference internal" href="routines.char.html#module-numpy.char" title="numpy.char"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.char</span></code></a>, which provides
the <a class="reference internal" href="generated/numpy.char.chararray.html#numpy.char.chararray" title="numpy.char.chararray"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.char.chararray</span></code></a> array subclass, in order for those routines
to get the performance benefits as well.</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<p>Prior to NumPy 2.0, all string functionality was in <a class="reference internal" href="routines.char.html#module-numpy.char" title="numpy.char"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.char</span></code></a>, which
only operated on fixed-width strings. That module will not be getting
updates and will be deprecated at some point in the future.</p>
</div>
<section id="string-operations">
<h2>String operations<a class="headerlink" href="#string-operations" title="Link to this heading">#</a></h2>
<div class="pst-scrollable-table-container"><table class="autosummary longtable table autosummary">
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.add.html#numpy.strings.add" title="numpy.strings.add"><code class="xref py py-obj docutils literal notranslate"><span class="pre">add</span></code></a>(x1, x2, /[, out, where, casting, order, ...])</p></td>
<td><p>Add arguments element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.center.html#numpy.strings.center" title="numpy.strings.center"><code class="xref py py-obj docutils literal notranslate"><span class="pre">center</span></code></a>(a, width[, fillchar])</p></td>
<td><p>Return a copy of <em class="xref py py-obj">a</em> with its elements centered in a string of length <em class="xref py py-obj">width</em>.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.capitalize.html#numpy.strings.capitalize" title="numpy.strings.capitalize"><code class="xref py py-obj docutils literal notranslate"><span class="pre">capitalize</span></code></a>(a)</p></td>
<td><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></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.decode.html#numpy.strings.decode" title="numpy.strings.decode"><code class="xref py py-obj docutils literal notranslate"><span class="pre">decode</span></code></a>(a[, encoding, errors])</p></td>
<td><p>Calls <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#bytes.decode" title="(in Python v3.13)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">bytes.decode</span></code></a> element-wise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.encode.html#numpy.strings.encode" title="numpy.strings.encode"><code class="xref py py-obj docutils literal notranslate"><span class="pre">encode</span></code></a>(a[, encoding, errors])</p></td>
<td><p>Calls <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str.encode" title="(in Python v3.13)"><code class="xref py py-meth docutils literal notranslate"><span class="pre">str.encode</span></code></a> element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.expandtabs.html#numpy.strings.expandtabs" title="numpy.strings.expandtabs"><code class="xref py py-obj docutils literal notranslate"><span class="pre">expandtabs</span></code></a>(a[, tabsize])</p></td>
<td><p>Return a copy of each string element where all tab characters are replaced by one or more spaces.</p></td>
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<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.ljust.html#numpy.strings.ljust" title="numpy.strings.ljust"><code class="xref py py-obj docutils literal notranslate"><span class="pre">ljust</span></code></a>(a, width[, fillchar])</p></td>
<td><p>Return an array with the elements of <em class="xref py py-obj">a</em> left-justified in a string of length <em class="xref py py-obj">width</em>.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.lower.html#numpy.strings.lower" title="numpy.strings.lower"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lower</span></code></a>(a)</p></td>
<td><p>Return an array with the elements converted to lowercase.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.lstrip.html#numpy.strings.lstrip" title="numpy.strings.lstrip"><code class="xref py py-obj docutils literal notranslate"><span class="pre">lstrip</span></code></a>(a[, chars])</p></td>
<td><p>For each element in <em class="xref py py-obj">a</em>, return a copy with the leading characters removed.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.mod.html#numpy.strings.mod" title="numpy.strings.mod"><code class="xref py py-obj docutils literal notranslate"><span class="pre">mod</span></code></a>(a, values)</p></td>
<td><p>Return (a % i), that is pre-Python 2.6 string formatting (interpolation), element-wise for a pair of array_likes of str or unicode.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.multiply.html#numpy.strings.multiply" title="numpy.strings.multiply"><code class="xref py py-obj docutils literal notranslate"><span class="pre">multiply</span></code></a>(a, i)</p></td>
<td><p>Return (a * i), that is string multiple concatenation, element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.partition.html#numpy.strings.partition" title="numpy.strings.partition"><code class="xref py py-obj docutils literal notranslate"><span class="pre">partition</span></code></a>(a, sep)</p></td>
<td><p>Partition each element in <code class="docutils literal notranslate"><span class="pre">a</span></code> around <code class="docutils literal notranslate"><span class="pre">sep</span></code>.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.replace.html#numpy.strings.replace" title="numpy.strings.replace"><code class="xref py py-obj docutils literal notranslate"><span class="pre">replace</span></code></a>(a, old, new[, count])</p></td>
<td><p>For each element in <code class="docutils literal notranslate"><span class="pre">a</span></code>, return a copy of the string with occurrences of substring <code class="docutils literal notranslate"><span class="pre">old</span></code> replaced by <code class="docutils literal notranslate"><span class="pre">new</span></code>.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.rjust.html#numpy.strings.rjust" title="numpy.strings.rjust"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rjust</span></code></a>(a, width[, fillchar])</p></td>
<td><p>Return an array with the elements of <em class="xref py py-obj">a</em> right-justified in a string of length <em class="xref py py-obj">width</em>.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.rpartition.html#numpy.strings.rpartition" title="numpy.strings.rpartition"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rpartition</span></code></a>(a, sep)</p></td>
<td><p>Partition (split) each element around the right-most separator.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.rstrip.html#numpy.strings.rstrip" title="numpy.strings.rstrip"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rstrip</span></code></a>(a[, chars])</p></td>
<td><p>For each element in <em class="xref py py-obj">a</em>, return a copy with the trailing characters removed.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.slice.html#numpy.strings.slice" title="numpy.strings.slice"><code class="xref py py-obj docutils literal notranslate"><span class="pre">slice</span></code></a>(a[, start, stop, step])</p></td>
<td><p>Slice the strings in <em class="xref py py-obj">a</em> by slices specified by <em class="xref py py-obj">start</em>, <em class="xref py py-obj">stop</em>, <em class="xref py py-obj">step</em>.</p></td>
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<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.strip.html#numpy.strings.strip" title="numpy.strings.strip"><code class="xref py py-obj docutils literal notranslate"><span class="pre">strip</span></code></a>(a[, chars])</p></td>
<td><p>For each element in <em class="xref py py-obj">a</em>, return a copy with the leading and trailing characters removed.</p></td>
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<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.swapcase.html#numpy.strings.swapcase" title="numpy.strings.swapcase"><code class="xref py py-obj docutils literal notranslate"><span class="pre">swapcase</span></code></a>(a)</p></td>
<td><p>Return element-wise a copy of the string with uppercase characters converted to lowercase and vice versa.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.title.html#numpy.strings.title" title="numpy.strings.title"><code class="xref py py-obj docutils literal notranslate"><span class="pre">title</span></code></a>(a)</p></td>
<td><p>Return element-wise title cased version of string or unicode.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.translate.html#numpy.strings.translate" title="numpy.strings.translate"><code class="xref py py-obj docutils literal notranslate"><span class="pre">translate</span></code></a>(a, table[, deletechars])</p></td>
<td><p>For each element in <em class="xref py py-obj">a</em>, return a copy of the string where all characters occurring in the optional argument <em class="xref py py-obj">deletechars</em> are removed, and the remaining characters have been mapped through the given translation table.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.upper.html#numpy.strings.upper" title="numpy.strings.upper"><code class="xref py py-obj docutils literal notranslate"><span class="pre">upper</span></code></a>(a)</p></td>
<td><p>Return an array with the elements converted to uppercase.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.zfill.html#numpy.strings.zfill" title="numpy.strings.zfill"><code class="xref py py-obj docutils literal notranslate"><span class="pre">zfill</span></code></a>(a, width)</p></td>
<td><p>Return the numeric string left-filled with zeros.</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="comparison">
<h2>Comparison<a class="headerlink" href="#comparison" title="Link to this heading">#</a></h2>
<p>The <a class="reference internal" href="#module-numpy.strings" title="numpy.strings"><code class="xref py py-obj docutils literal notranslate"><span class="pre">numpy.strings</span></code></a> module also exports the comparison universal functions
that can now operate on string arrays as well.</p>
<div class="pst-scrollable-table-container"><table class="autosummary longtable table autosummary">
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.equal.html#numpy.strings.equal" title="numpy.strings.equal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">equal</span></code></a>(x1, x2, /[, out, where, casting, ...])</p></td>
<td><p>Return (x1 == x2) element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.not_equal.html#numpy.strings.not_equal" title="numpy.strings.not_equal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">not_equal</span></code></a>(x1, x2, /[, out, where, casting, ...])</p></td>
<td><p>Return (x1 != x2) element-wise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.greater_equal.html#numpy.strings.greater_equal" title="numpy.strings.greater_equal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">greater_equal</span></code></a>(x1, x2, /[, out, where, ...])</p></td>
<td><p>Return the truth value of (x1 >= x2) element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.less_equal.html#numpy.strings.less_equal" title="numpy.strings.less_equal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">less_equal</span></code></a>(x1, x2, /[, out, where, casting, ...])</p></td>
<td><p>Return the truth value of (x1 <= x2) element-wise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.greater.html#numpy.strings.greater" title="numpy.strings.greater"><code class="xref py py-obj docutils literal notranslate"><span class="pre">greater</span></code></a>(x1, x2, /[, out, where, casting, ...])</p></td>
<td><p>Return the truth value of (x1 > x2) element-wise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.less.html#numpy.strings.less" title="numpy.strings.less"><code class="xref py py-obj docutils literal notranslate"><span class="pre">less</span></code></a>(x1, x2, /[, out, where, casting, ...])</p></td>
<td><p>Return the truth value of (x1 < x2) element-wise.</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="string-information">
<h2>String information<a class="headerlink" href="#string-information" title="Link to this heading">#</a></h2>
<div class="pst-scrollable-table-container"><table class="autosummary longtable table autosummary">
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.count.html#numpy.strings.count" title="numpy.strings.count"><code class="xref py py-obj docutils literal notranslate"><span class="pre">count</span></code></a>(a, sub[, start, end])</p></td>
<td><p>Returns an array with the number of non-overlapping occurrences of substring <code class="docutils literal notranslate"><span class="pre">sub</span></code> in the range [<code class="docutils literal notranslate"><span class="pre">start</span></code>, <code class="docutils literal notranslate"><span class="pre">end</span></code>).</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.endswith.html#numpy.strings.endswith" title="numpy.strings.endswith"><code class="xref py py-obj docutils literal notranslate"><span class="pre">endswith</span></code></a>(a, suffix[, start, end])</p></td>
<td><p>Returns a boolean array which is <em class="xref py py-obj">True</em> where the string element in <code class="docutils literal notranslate"><span class="pre">a</span></code> ends with <code class="docutils literal notranslate"><span class="pre">suffix</span></code>, otherwise <em class="xref py py-obj">False</em>.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.find.html#numpy.strings.find" title="numpy.strings.find"><code class="xref py py-obj docutils literal notranslate"><span class="pre">find</span></code></a>(a, sub[, start, end])</p></td>
<td><p>For each element, return the lowest index in the string where substring <code class="docutils literal notranslate"><span class="pre">sub</span></code> is found, such that <code class="docutils literal notranslate"><span class="pre">sub</span></code> is contained in the range [<code class="docutils literal notranslate"><span class="pre">start</span></code>, <code class="docutils literal notranslate"><span class="pre">end</span></code>).</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.index.html#numpy.strings.index" title="numpy.strings.index"><code class="xref py py-obj docutils literal notranslate"><span class="pre">index</span></code></a>(a, sub[, start, end])</p></td>
<td><p>Like <a class="reference internal" href="generated/numpy.strings.find.html#numpy.strings.find" title="numpy.strings.find"><code class="xref py py-obj docutils literal notranslate"><span class="pre">find</span></code></a>, but raises <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.13)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> when the substring is not found.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.isalnum.html#numpy.strings.isalnum" title="numpy.strings.isalnum"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isalnum</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if all characters in the string are alphanumeric and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.isalpha.html#numpy.strings.isalpha" title="numpy.strings.isalpha"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isalpha</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if all characters in the data interpreted as a string are alphabetic and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.isdecimal.html#numpy.strings.isdecimal" title="numpy.strings.isdecimal"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isdecimal</span></code></a>(x, /[, out, where, casting, ...])</p></td>
<td><p>For each element, return True if there are only decimal characters in the element.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.isdigit.html#numpy.strings.isdigit" title="numpy.strings.isdigit"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isdigit</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if all characters in the string are digits and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.islower.html#numpy.strings.islower" title="numpy.strings.islower"><code class="xref py py-obj docutils literal notranslate"><span class="pre">islower</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if all cased characters in the string are lowercase and there is at least one cased character, false otherwise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.isnumeric.html#numpy.strings.isnumeric" title="numpy.strings.isnumeric"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isnumeric</span></code></a>(x, /[, out, where, casting, ...])</p></td>
<td><p>For each element, return True if there are only numeric characters in the element.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.isspace.html#numpy.strings.isspace" title="numpy.strings.isspace"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isspace</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if there are only whitespace characters in the string and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.istitle.html#numpy.strings.istitle" title="numpy.strings.istitle"><code class="xref py py-obj docutils literal notranslate"><span class="pre">istitle</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns true for each element if the element is a titlecased string and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.isupper.html#numpy.strings.isupper" title="numpy.strings.isupper"><code class="xref py py-obj docutils literal notranslate"><span class="pre">isupper</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Return true for each element if all cased characters in the string are uppercase and there is at least one character, false otherwise.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.rfind.html#numpy.strings.rfind" title="numpy.strings.rfind"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rfind</span></code></a>(a, sub[, start, end])</p></td>
<td><p>For each element, return the highest index in the string where substring <code class="docutils literal notranslate"><span class="pre">sub</span></code> is found, such that <code class="docutils literal notranslate"><span class="pre">sub</span></code> is contained in the range [<code class="docutils literal notranslate"><span class="pre">start</span></code>, <code class="docutils literal notranslate"><span class="pre">end</span></code>).</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.rindex.html#numpy.strings.rindex" title="numpy.strings.rindex"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rindex</span></code></a>(a, sub[, start, end])</p></td>
<td><p>Like <a class="reference internal" href="generated/numpy.strings.rfind.html#numpy.strings.rfind" title="numpy.strings.rfind"><code class="xref py py-obj docutils literal notranslate"><span class="pre">rfind</span></code></a>, but raises <a class="reference external" href="https://docs.python.org/3/library/exceptions.html#ValueError" title="(in Python v3.13)"><code class="xref py py-exc docutils literal notranslate"><span class="pre">ValueError</span></code></a> when the substring <em class="xref py py-obj">sub</em> is not found.</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="generated/numpy.strings.startswith.html#numpy.strings.startswith" title="numpy.strings.startswith"><code class="xref py py-obj docutils literal notranslate"><span class="pre">startswith</span></code></a>(a, prefix[, start, end])</p></td>
<td><p>Returns a boolean array which is <em class="xref py py-obj">True</em> where the string element in <code class="docutils literal notranslate"><span class="pre">a</span></code> starts with <code class="docutils literal notranslate"><span class="pre">prefix</span></code>, otherwise <em class="xref py py-obj">False</em>.</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/numpy.strings.str_len.html#numpy.strings.str_len" title="numpy.strings.str_len"><code class="xref py py-obj docutils literal notranslate"><span class="pre">str_len</span></code></a>(x, /[, out, where, casting, order, ...])</p></td>
<td><p>Returns the length of each element.</p></td>
</tr>
</tbody>
</table>
</div>
</section>
</section>
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