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[Tut] A Comprehensive Guide to maxsplit in Python

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A Comprehensive Guide to maxsplit in Python

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<p class="has-background" style="background-color:#feddfe"><strong>Summary:</strong> <code>maxsplit</code> is one of the optional parameters used in the <code>split()</code> function. If maxsplit is specified within the <code>split</code> function, then the maximum number of splits done will be given by the specified maxsplit. Thus, the list will have at most <code>maxsplit + 1</code> elements. If maxsplit is not specified or set to <code>-1</code>, then there is no limit on the number of splits (all the possible splits are made).</p>
<h3><strong>Minimal Example</strong></h3>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">cols = 'Red, Black, White, Yellow, Pink' # Maxsplit 0
print(cols.split(', ', 0))
# ['Red, Black, White, Yellow, Pink'] # Maxsplit 1
print(cols.split(', ', 1))
# ['Red', 'Black, White, Yellow, Pink'] # Maxsplit 3
print(cols.split(', ', 3))
# ['Red', 'Black', 'White', 'Yellow, Pink'] # Maxsplit 5
print(cols.split(', ', 5))
# ['Red', 'Black', 'White', 'Yellow', 'Pink']</pre>
<p>In this comprehensive guide, you will learn everything you need to know about <code>maxsplit</code> in Python.</p>
<h2><strong>What is Maxsplit Anyways?</strong></h2>
<p>Before you understand what maxsplit does, it is important to understand what the <code>split</code> function does. The <code>split()</code> function in Python splits the string at a given separator and returns a split list of substrings.</p>
<p class="has-base-background-color has-background"><strong>Syntax and Explanation:</strong> <br /><code>str.split(sep = None, maxsplit = -1)</code></p>
<p class="has-global-color-8-background-color has-background"><img src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f680.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" /> <strong>maxsplit</strong> is an optional parameter that defines the maximum number of splits (the list will have at most <em>maxsplit + 1</em> elements). If maxsplit is not provided or defined as <em>-1</em>, then there is no limit on the number of splits (all the possible splits get made).</p>
<p class="has-background" style="background-color:#deffde"><strong><img src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f985.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" />Related Read: </strong><a href="https://blog.finxter.com/python-string-split/"><strong>Python String split()</strong></a></p>
<h3><strong>How Many Elements will The List Contain when Maxsplit is Specified?</strong></h3>
<p>When the maxsplit is specified, the list will have a maximum of <code>maxsplit + 1 </code>items. Look at the following examples to understand this better.</p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="4,18,12" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">text = 'Python Java C Ruby' # Example 1
print(text.split(' ', 0))
# ['Python Java C Ruby'] # Example 2
print(text.split(' ', 2))
# ['Python', 'Java', 'C Ruby'] # Example 3
print(text.split(' ', -1))
# ['Python', 'Java', 'C', 'Ruby']</pre>
<p><strong>Explanation: </strong>In the first example, the <code>maxsplit</code> gets set to <code>0</code>. Hence the list will have a maximum of one item. In the second example, maxsplit is set to <code>2</code>, therefore the resultant list will have 2+1 = 3 items. Note that in the third example, maxsplit gets specified as <code>-1</code>; hence by default all the possible splits have been made.</p>
<h3><strong>Will the split() Function Work if You Don’t Specify Any <strong>Parameter</strong>?</strong></h3>
<p><strong>Example:</strong></p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">txt = 'Welcome to the world of Python'
print(txt.split())
# ['Welcome', 'to', 'the', 'world', 'of', 'Python']</pre>
<p>The <code>split()</code> function works perfectly fine even when no arguments are specified. In the above example, no separator and no maxsplit has been specified. It takes the default separator (space) to split the string. By default, the maxsplit value is <code>-1</code>. So the string gets split wherever a space is found. Meaning the maximum number of splits will be performed.</p>
<h2><strong>Split a List up to a Maximum Number of Elements</strong></h2>
<p><strong>Problem:  </strong>Given a list; How will you split the list up to a maximum number of elements?</p>
<p><strong>Example: </strong>Let’s visualize the problem with a real problem asked in <a rel="noreferrer noopener" href="https://stackoverflow.com/questions/58952417/split-a-list-up-to-a-maximum-number-of-elements" target="_blank">StackOverflow</a>.</p>
<figure class="wp-block-image size-full is-style-default"><img loading="lazy" decoding="async" width="670" height="560" src="https://blog.finxter.com/wp-content/uploads/2022/12/image-132.png" alt="" class="wp-image-966390" srcset="https://blog.finxter.com/wp-content/uploads/2022/12/image-132.png 670w, https://blog.finxter.com/wp-content/uplo...00x251.png 300w" sizes="(max-width: 670px) 100vw, 670px" /><figcaption class="wp-element-caption">source: <a href="https://stackoverflow.com/questions/58952417/split-a-list-up-to-a-maximum-number-of-elements">https://stackoverflow.com/questions/58952417/split-a-list-up-to-a-maximum-number-of-elements</a></figcaption></figure>
<p><strong>Discussion: </strong>The question essentially requires you to split the first and the second item/row into 7 columns such that the expected output resembles the following: <code>[['6697', '1100.0', '90.0', '0.0', '0.0', '6609', '!'], ['701', '0.0', '0.0', '83.9', '1.5', '000', '!AFR-AHS IndHS-AFR']] </code></p>
<p><strong>Solution:</strong></p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="5" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">rot = ['6697 1100.0 90.0 0.0 0.0 6609 !', '701 0.0 0.0 83.9 1.5 000 !AFR-AHS IndHS-AFR'] for i in range(len(rot)): rot[i] = rot[i].split(maxsplit=6) print(rot) # [['6697', '1100.0', '90.0', '0.0', '0.0', '6609', '!'], ['701', '0.0', '0.0', '83.9', '1.5', '000', '!AFR-AHS IndHS-AFR']]</pre>
<p><strong>Explanation:</strong> Use the <code>split()</code> method and specify the maxsplit argument as the maximum number of elements in the list that you want to group. In this case, you need seven splits. Hence, the maxsplit can be set to 6 to achieve the final output.</p>
<h2><strong>Exercise</strong></h2>
<p class="has-background" style="background-color:#fdf6bf"><strong>Given:</strong><br />text = “abc_kjh_olp_xyz”<br /><strong>Challenge: </strong>Split the given string only at the first occurrence of the underscore “_”<br /><strong>Expected Output:</strong><br />[‘abc’, ‘kjh_olp_xyz’]</p>
<p><strong>Solution</strong></p>
<pre class="EnlighterJSRAW" data-enlighter-language="generic" data-enlighter-theme="" data-enlighter-highlight="" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group="">text = "abc_kjh_olp_xyz"
print(text.split("_", maxsplit=1))</pre>
<p class="has-background" style="background-color:#deffde"><strong><img src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f985.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" />Related Read: <a href="https://blog.finxter.com/python-split-string-at-first-occurrence/" target="_blank" rel="noreferrer noopener">Python Split String at First Occurrence</a></strong></p>
<h2>Conclusion</h2>
<p>That was all about the maxsplit parameter from the split() function in Python. I hope this <a rel="noreferrer noopener" href="https://blog.finxter.com/" target="_blank"><strong>article</strong></a> helped you to gain an in-depth insight into the maxsplit parameter. Please <strong><a rel="noreferrer noopener" href="https://blog.finxter.com/subscribe/" target="_blank">subscribe and stay tuned</a></strong> for more interesting articles! Happy coding.</p>
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