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Articles on Trending Technologies
Technical articles with clear explanations and examples
Python – Remove Tuples with difference greater than K
When working with tuples, you may need to filter out tuples where the absolute difference between elements exceeds a threshold value K. Python provides an efficient way to accomplish this using list comprehension and the abs() function. Example Here's how to remove tuples with difference greater than K ? my_tuple = [(41, 18), (21, 57), (39, 22), (23, 42), (22, 10)] print("The tuple is :") print(my_tuple) K = 20 my_result = [element for element in my_tuple if abs(element[0] - element[1])
Read MorePython – Remove dictionary from a list of dictionaries if a particular value is not present
When you need to remove a dictionary from a list based on whether a particular value is present or absent, you can use several approaches. The most common methods are iteration with del, list comprehension, or the filter() function. Method 1: Using del with Index-based Iteration This method iterates through the list and removes the dictionary when a condition is met ? my_list = [{"id": 1, "data": "Python"}, {"id": 2, "data": "Code"}, {"id": 3, ...
Read MorePython – Extract Strings with Successive Alphabets in Alphabetical Order
When working with strings, you may need to extract strings that contain successive alphabets in alphabetical order. This means finding strings where at least two consecutive characters follow each other in the alphabet (like 'hi' where 'h' and 'i' are consecutive). Understanding Successive Alphabets Successive alphabets are characters that follow each other in the alphabet sequence. For example: 'ab' - 'a' and 'b' are successive 'hi' - 'h' and 'i' are successive 'xyz' - 'x', 'y', 'z' are all successive Method: Using ord() Function The ord() function returns the Unicode code point of a ...
Read MorePython – Test for desired String Lengths
When it is required to test for desired string lengths, a simple iteration and the len() method can be used. This technique helps verify that each string in a list matches its corresponding expected length. Using Basic Iteration Below is a demonstration of checking string lengths using a for loop ? strings = ["python", "is", "fun", "to", "learn", "Will", "how"] print("The list is :") print(strings) expected_lengths = [6, 2, 3, 2, 5, 4, 3] result = True for index in range(len(strings)): if len(strings[index]) != expected_lengths[index]: ...
Read MorePython program to Sort a List of Strings by the Number of Unique Characters
When it is required to sort a list of strings based on the number of unique characters, a method is defined that uses a set operator, the list method and the len method. Example Below is a demonstration of the same − def my_sort_func(my_elem): return len(list(set(my_elem))) my_list = ['python', "Will", "Hi", "how", 'fun', 'learn', 'code'] print("The list is : ") print(my_list) my_list.sort(key = my_sort_func) print("The result is :") print(my_list) Output The list is : ['python', 'Will', 'Hi', 'how', 'fun', 'learn', 'code'] The result is ...
Read MorePython Program that extract words starting with Vowel From A list
When you need to extract words starting with vowels from a list, Python offers several approaches. You can use iteration with the startswith() method, list comprehensions, or the filter() function. Using Loop with startswith() Method This approach uses a flag to check if each word starts with any vowel ? words = ["abc", "phy", "and", "okay", "educate", "learn", "code"] print("The list is:") print(words) result = [] vowels = "aeiou" print("The vowels are:", vowels) for word in words: flag = False for vowel in vowels: ...
Read MorePython program to print Rows where all its Elements' frequency is greater than K
When working with nested lists (2D arrays), you may need to filter rows where every element appears more than K times within that row. Python provides an elegant solution using the all() function combined with list comprehension. Understanding the Problem We want to find rows where each element's frequency within that specific row exceeds a threshold value K. For example, in row [11, 11, 11, 11], the element 11 appears 4 times, so its frequency is 4. Solution Using Custom Function Here's a complete program that defines a helper function to check frequency conditions ? ...
Read MorePython Program to repeat elements at custom indices
When working with lists, you might need to repeat certain elements at specific positions. This can be achieved using Python's enumerate() function along with the extend() and append() methods to create a new list with duplicated elements at custom indices. Basic Approach Using enumerate() The most straightforward method is to iterate through the original list and check if the current index should have its element repeated ? original_list = [34, 56, 77, 23, 31, 29, 62, 99] print("The original list is:") print(original_list) indices_to_repeat = [3, 1, 4, 6] result = [] for index, element ...
Read MorePython – Inverse Dictionary Values List
Inverting a dictionary means swapping keys and values. When the original dictionary has lists as values, we create a new dictionary where each item in those lists becomes a key, and the original keys become the values. Using defaultdict The defaultdict from collections module automatically creates empty lists for new keys ? from collections import defaultdict my_dict = {13: [12, 23], 22: [31], 34: [21], 44: [52, 31]} print("The original dictionary is:") print(my_dict) inverted_dict = defaultdict(list) for key, values in my_dict.items(): for value in values: ...
Read MorePython – Sort String list by K character frequency
When it is required to sort a list of strings based on the K character frequency, the sorted() method and lambda function can be used. This technique counts how many times a specific character appears in each string and sorts accordingly. Syntax sorted(iterable, key=lambda string: -string.count(character)) Example Below is a demonstration of sorting strings by character frequency ? string_list = ['Hi', 'Will', 'Jack', 'Python', 'Bill', 'Mills', 'goodwill'] print("Original list:") print(string_list) K = 'l' print(f"Sorting by character '{K}' frequency:") # Sort by K character frequency (descending order) result = sorted(string_list, key=lambda ...
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