+- Sick Gaming (https://www.sickgaming.net)
+-- Forum: Programming (https://www.sickgaming.net/forum-76.html)
+--- Forum: Python (https://www.sickgaming.net/forum-83.html)
+--- Thread: [Tut] Python Int to String with Trailing Zeros (/thread-103559.html)
[Tut] Python Int to String with Trailing Zeros - xSicKxBot - 12-01-2025
[Tut] Python Int to String with Trailing Zeros
<div>
<div class="kk-star-ratings kksr-auto kksr-align-left kksr-valign-top" data-payload='{"align":"left","id":"1651835","slug":"default","valign":"top","ignore":"","reference":"auto","class":"","count":"1","legendonly":"","readonly":"","score":"5","starsonly":"","best":"5","gap":"5","greet":"Rate this post","legend":"5\/5 - (1 vote)","size":"24","title":"Python Int to String with Trailing Zeros","width":"142.5","_legend":"{score}\/{best} - ({count} {votes})","font_factor":"1.25"}'>
<div class="kksr-stars">
<div class="kksr-stars-inactive">
<div class="kksr-star" data-star="1" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" data-star="2" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" data-star="3" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" data-star="4" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" data-star="5" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
</p></div>
<div class="kksr-stars-active" style="width: 142.5px;">
<div class="kksr-star" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
<div class="kksr-star" style="padding-right: 5px">
<div class="kksr-icon" style="width: 24px; height: 24px;"></div>
</p></div>
</p></div>
</div>
<div class="kksr-legend" style="font-size: 19.2px;"> 5/5 – (1 vote) </div>
</p></div>
<p class="has-pale-cyan-blue-background-color has-background">To add trailing zeros to a string up to a certain length in Python, convert the number to a string and use the <code>ljust(width, '0')</code> method. Call this method on the string, specifying the total desired <code>width</code> and the padding character <code>'0'</code>. This will append zeros to the right of the string until the specified <code>width</code> is achieved.</p>
<p><strong>Challenge</strong>: Given an integer number. How to convert it to a string by adding trailing zeros so that the string has a fixed number of positions. </p>
<p><strong>Example</strong>: For integer 42, you want to fill it up with trailing zeros to the following string with 5 characters: <code>'42000'</code>. </p>
<p><em>In all methods, we assume that the integer has less than 5 characters. </em></p>
<h2 class="wp-block-heading">Method 1: string.ljust()</h2>
<p class="has-global-color-8-background-color has-background">In Python, you can use the <code><a href="https://blog.finxter.com/python-string-ljust/">str.ljust()</a></code> method to pad zeros (or any other character) to the right of a string. The <code>ljust()</code> method returns the string left-justified in a field of a given width, padded with a specified character (default is space). </p>
<p>Below is an example of how to use <code>ljust()</code> to add trailing zeros to a number:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="8" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group=""># Integer value to be converted
i = 42 # Convert the integer to a string
s = str(i) # Use ljust to add trailing zeros, specifying the total width and the padding character ('0')
s_padded = s.ljust(5, '0') print(s_padded)
# Output: '42000'
</pre>
<p>In this example:</p>
<ul>
<li><code>str(i)</code> converts the integer <code>i</code> to a string.</li>
<li><code>s.ljust(5, '0')</code> pads the string <code>s</code> with zeros to the right to make the total width 5 characters.</li>
</ul>
<p>This is the most Pythonic way to accomplish this challenge. </p>
<h2 class="wp-block-heading">Method 2: Format String</h2>
<p>The second method uses the <a title="https://docs.python.org/3/library/string.html#format-string-syntax" href="https://docs.python.org/3/library/string.html#format-string-syntax" target="_blank" rel="noreferrer noopener">format string feature</a> in Python 3+ called f-strings or <em>replacement fields</em>. </p>
<p class="has-global-color-8-background-color has-background"><img decoding="async" src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f4a1.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" /> <strong>Info</strong>: In Python, f-strings allow for the embedding of expressions within strings by prefixing a string with the letter <code>"f"</code> or <code>"F"</code> and enclosing expressions within curly braces <code>{}</code>. The expressions within the curly braces in the f-string are evaluated, and their values are inserted into the resulting string. This allows for a concise and readable way to include variable values or complex expressions within string literals.</p>
<p>The following f-string converts an integer <code>i</code> to a string while adding trailing zeros to a given integer:</p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="5-6" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group=""># Integer value to be converted
i = 42 # Convert the integer to a string and then use format to add trailing zeros
s1 = f'{str(i):<5}'
s1 = s1.replace(" ", "0") # replace spaces with zeros print(s1)
# 42000
</pre>
<p>The code <code>f'{str(i):<5}'</code> first converts the integer <code>i</code> to a string. The <code>:<5</code> format specifier aligns the string to the left and pads with spaces to make the total width 5. Then we replace the padded spaces with zeros using the <code><a href="https://blog.finxter.com/python-string-replace-2/">string.replace()</a></code> function.</p>
</p>
<h2 class="wp-block-heading">Method 3: List Comprehension</h2>
<p>Many Python coders don’t quite get the f-strings and the <code>ljust()</code> method shown in Methods 1 and 2. If you don’t have time to learn them, you can also use a more standard way based on <a title="Daily Python Puzzle: String Concatenation" href="https://blog.finxter.com/daily-python-puzzle-string-concatenation/" target="_blank" rel="noreferrer noopener">string concatenation</a> and <a title="List Comprehension in Python — A Helpful Illustrated Guide" href="https://blog.finxter.com/list-comprehension/" target="_blank" rel="noreferrer noopener">list comprehension</a>. </p>
<pre class="EnlighterJSRAW" data-enlighter-language="python" data-enlighter-theme="" data-enlighter-highlight="4" data-enlighter-linenumbers="" data-enlighter-lineoffset="" data-enlighter-title="" data-enlighter-group=""># Method 3: List Comprehension
s3 = str(42)
n = len(s3)
s3 = s3 + '0' * (5-len(s3))
print(s3)
# 42000</pre>
<p>You first convert the integer to a basic string. Then, you concatenate the integer’s string representation to the string of <code>0</code>s, filled up to <code>n=5</code> characters. The <a title="What is the Asterisk / Star Operator (*) in Python?" href="https://blog.finxter.com/what-is-asterisk-in-python/" target="_blank" rel="noreferrer noopener">asterisk operator</a> creates a string of <code>5-len(s3)</code> zeros here. </p>
<h2 class="wp-block-heading">Programmer Humor</h2>
<div class="wp-block-image">
<figure class="aligncenter size-full"><img decoding="async" fetchpriority="high" width="925" height="507" src="https://blog.finxter.com/wp-content/uploads/2022/06/image-9.png" alt="" class="wp-image-401703" srcset="https://blog.finxter.com/wp-content/uploads/2022/06/image-9.png 925w, https://blog.finxter.com/wp-content/uploads/2022/06/image-9-300x164.png 300w, https://blog.finxter.com/wp-content/uploads/2022/06/image-9-768x421.png 768w" sizes="(max-width: 925px) 100vw, 925px" /><figcaption><em>“Real programmers set the universal constants at the start such that the universe evolves to contain the disk with the data they want.”</em> — <a rel="noreferrer noopener" href="https://imgs.xkcd.com/comics/real_programmers.png" data-type="URL" data-id="https://imgs.xkcd.com/comics/real_programmers.png" target="_blank">xkcd</a></figcaption></figure>
</div>
<p class="has-base-2-background-color has-background"><img decoding="async" src="https://s.w.org/images/core/emoji/14.0.0/72x72/1f517.png" alt="?" class="wp-smiley" style="height: 1em; max-height: 1em;" /> <strong>Recommended</strong>: <a href="https://blog.finxter.com/python-int-to-string-with-leading-zeros/">Python Int to String with Leading Zeros</a></p>
<p>The post <a rel="nofollow" href="https://blog.finxter.com/python-int-to-string-with-trailing-zeros/">Python Int to String with Trailing Zeros</a> appeared first on <a rel="nofollow" href="https://blog.finxter.com">Be on the Right Side of Change</a>.</p>
</div>
https://www.sickgaming.net/blog/2023/09/27/python-int-to-string-with-trailing-zeros/