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Articles on Trending Technologies
Technical articles with clear explanations and examples
Find all the numbers in a string using regular expression in Python
Extracting numbers from text is a common requirement in Python data analytics. Regular expressions provide a powerful way to define patterns for matching digits, decimal numbers, and numbers with signs. Basic Number Extraction The re.findall() function extracts all occurrences of a pattern from a string. The pattern r'\d+' matches one or more consecutive digits ? import re text = "Go to 13.8 miles and then -4.112 miles." numbers = re.findall(r'\d+', text) print(numbers) ['13', '8', '4', '112'] Note that this pattern extracts only digits, splitting decimal numbers and ignoring signs. ...
Read MoreDifference Between :first-child and :first-of-type selector in CSS
The :first-child and :first-of-type selectors are CSS pseudo-classes that help target specific elements within a parent container. While they may seem similar, they work very differently and understanding their distinction is crucial for precise element selection. The :first-child selector targets the very first child element of a parent, regardless of its element type. The :first-of-type selector targets the first element of a specific type within a parent container. Syntax /* :first-child selector */ element:first-child { property: value; } /* :first-of-type selector */ element:first-of-type { property: value; } ...
Read MoreCount frequencies of all elements in array in Python using collections module
Python lists allow duplicate elements, so we often need to count how many times each element appears. The frequency of elements indicates how many times an element occurs in a list. The Counter class from the collections module provides an efficient way to count element frequencies. Syntax Counter(iterable) Where iterable is any Python iterable like a list, tuple, or string. Basic Example The Counter() function returns a dictionary-like object with elements as keys and their counts as values − from collections import Counter days = ['Mon', 'Tue', 'Wed', 'Mon', 'Mon', ...
Read MoreWhat is Progressive Rendering?
Progressive rendering is a web development technique that improves website loading speed by displaying content in chunks rather than waiting for the entire page to load. This approach significantly enhances user experience and can reduce visitor bounce rates. What is Progressive Rendering? Progressive rendering breaks down web page content into smaller, manageable pieces that load sequentially. Instead of waiting for all HTML, CSS, and JavaScript to download before showing anything, the browser displays content as it becomes available. Progressive rendering is a technique where developers structure their code to prioritize critical content first, allowing users to interact ...
Read MoreCount distinct elements in an array in Python
In Python lists, we often encounter duplicate elements. While len() gives us the total count including duplicates, we sometimes need to count only the distinct (unique) elements. Python provides several approaches to accomplish this task. Using Counter from collections The Counter class from the collections module creates a dictionary where elements are keys and their frequencies are values. We can use its keys() method to get distinct elements ? from collections import Counter days = ['Mon', 'Tue', 'Wed', 'Mon', 'Tue'] print("Length of original list:", len(days)) distinct_elements = Counter(days).keys() print("List with distinct elements:", list(distinct_elements)) print("Length ...
Read MoreWhat is greater-than sign (>) selector in CSS?
In CSS, the greater-than sign (>) is used as a child combinator selector. It selects only the direct children of a parent element, not elements that are nested deeper in the hierarchy. Syntax parent > child { /* CSS styles */ } In the above syntax, parent is the parent element, and child is the direct child element. The styles are applied only to the direct children, not to grandchildren or deeper nested elements. Example 1: Basic Direct Child Selection The following example demonstrates how the > selector works ...
Read MoreWhat is Graceful Degradation in CSS?
Graceful degradation in CSS is a design philosophy that ensures websites remain functional and visually acceptable even when advanced features aren't supported by older browsers. Instead of breaking completely, the website "gracefully" falls back to simpler alternatives while maintaining core functionality. Syntax /* Modern feature */ selector { property: modern-value; property: fallback-value; /* Fallback for older browsers */ } Different Techniques for Graceful Degradation Progressive Enhancement This technique involves building from a solid foundation and adding enhancements layer by layer. Start with basic HTML, add ...
Read MoreWhat is font-family -apple-system?
The -apple-system value of the CSS font-family property allows developers to use the same font that the Apple operating system uses. This ensures that your web content appears with fonts that match the user's device preferences on Apple devices like Mac, iPhone, and iPad. Syntax font-family: -apple-system; The font-family property accepts multiple font names as fallback values. If the browser doesn't support the first font, it tries the next one in the list. font-family: -apple-system, fallback-font1, fallback-font2; Example 1: Basic Usage The following example demonstrates how to apply the -apple-system ...
Read MoreWhat is Float Containment in CSS?
Float containment is a CSS technique used to control the layout of web page elements when using the float property. When an element is floated, it is removed from the normal document flow, which can cause layout issues where parent containers don't expand to contain their floated children properly. The Problem with Float When you set the float property for any HTML element, it gets removed from the original document flow but remains in the viewport. This causes the parent element to not recognize the floated child's dimensions, leading to layout collapse ? ...
Read MoreWhat does the CSS rule “clear: both” do?
The CSS clear: both property is used to prevent elements from floating alongside other floated elements. When applied to an element, it forces that element to move below any preceding floated elements (both left and right floated), ensuring proper layout flow. Syntax selector { clear: both; } Possible Values ValueDescription leftClears left floated elements only rightClears right floated elements only bothClears both left and right floated elements noneDefault value; allows floating on both sides Example 1: Basic Clear Both Usage The following example shows how clear: ...
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