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Articles by Hafeezul Kareem
258 articles
Python - Inserting item in sorted list maintaining order
In this article, we are going to learn how to insert an item in a sorted list while maintaining the order. Python has a built-in module called bisect that helps us insert any element in the appropriate position in the list efficiently. Using bisect.insort() The bisect.insort() method uses binary search to find the correct insertion point and inserts the element while maintaining the sorted order ? # importing the module import bisect # initializing the list, element numbers = [10, 23, 27, 32] element = 25 # inserting element using bisect.insort(list, element) bisect.insort(numbers, element) ...
Read MorePython - Intersect two dictionaries through keys
In Python, intersecting two dictionaries through keys means creating a new dictionary containing only the keys that exist in both dictionaries. This is useful for finding common data between two datasets. Input: dict_1 = {'A': 1, 'B': 2, 'C': 3} dict_2 = {'A': 1, 'C': 4, 'D': 5} Output: {'A': 1, 'C': 3} Using Dictionary Comprehension Dictionary comprehension provides the most readable approach to intersect dictionaries by keys ? # initializing the dictionaries dict_1 = {'A': 1, 'B': 2, 'C': 3} dict_2 = {'A': 1, 'C': 4, 'D': 5} # finding ...
Read MorePython - Intersection of multiple lists
In this article, we will explore different approaches to find the intersection of multiple lists containing sub-lists. The intersection returns only the common sub-lists present in all input lists. Using List Comprehension The simplest approach uses list comprehension to check if each sub-list exists in all other lists − # initializing the lists list_1 = [[1, 2], [3, 4], [5, 6]] list_2 = [[3, 4], [7, 8]] # finding the common items from both lists result = [sub_list for sub_list in list_1 if sub_list in list_2] # printing the result print("Intersection using list comprehension:", ...
Read MorePython - Intersection of two String
String intersection finds the common characters between two strings. Python offers multiple approaches: iterating through characters or using set operations for efficient intersection. Using Character Iteration This method iterates through the first string and adds characters that exist in both strings while maintaining order ? # initializing the string string_1 = 'tutorialspoint' string_2 = 'tut' result = '' # finding the common chars from both strings for char in string_1: if char in string_2 and not char in result: result += char ...
Read MorePython - Join tuple elements in a list
In this article, we are going to learn how to join tuple elements in a list. Python provides several approaches to convert tuples containing strings into joined strings using methods like join() and map(). Using map() with a Custom Function Create a function to join tuple elements and apply it to all tuples using map() ? # initializing the list with tuples string_tuples = [('A', 'B', 'C'), ('Tutorialspoint', 'is a', 'popular', 'site', 'for tech learnings')] # function that converts tuple to string def join_tuple_string(strings_tuple): return ' '.join(strings_tuple) # joining all ...
Read MorePython - Joining only adjacent words in list
In this article, we are going to learn how to join adjacent words in a list while keeping digits separate. This technique is useful when processing mixed data that contains both text and numeric values. Approach To solve this problem, we need to ? Initialize the list with mixed string and numeric elements Separate words from digits using isalpha() and isdigit() methods Join all the words together using the join() method Add all digits to the result list while maintaining their order Using List Comprehension The most straightforward approach uses list comprehension to ...
Read MorePython - Joining unicode list elements
In Python, when working with Unicode strings, you might need to join list elements that contain Unicode characters. This is straightforward in Python 3 since all strings are Unicode by default. Basic Unicode String Joining The simplest way to join Unicode strings is using the join() method ? # Unicode strings with special characters unicode_strings = ['Hello', 'Wörld', 'Pythön', '🐍'] # Join with space separator result = ' '.join(unicode_strings) print(result) Hello Wörld Pythön 🐍 Joining Mixed Content Lists When your list contains mixed data types, convert them to strings ...
Read MorePython - Largest number possible from list of given numbers
In this article, we will learn how to find the largest possible number from a given list of numbers by arranging them optimally. We'll explore two different approaches to solve this problem effectively. Method 1: Using itertools.permutations The first approach generates all possible permutations of the numbers and finds the maximum value ? import itertools # initializing the list numbers = [45, 35, 138, 43, 67] # result list to store all permutations result = [] # generate all permutations and join them as strings for permutation in itertools.permutations(str(number) for number in numbers): ...
Read MoreLast occurrence of some element in a list in Python
Finding the last occurrence of an element in a list is a common task in Python. There are several efficient approaches to accomplish this, each with different advantages depending on your specific needs. Using Reverse and Index Method The first approach reverses the list and finds the first occurrence, then calculates the original position ? # initializing the list words = ['eat', 'sleep', 'drink', 'sleep', 'drink', 'sleep', 'go', 'come'] element = 'sleep' # reversing the list words.reverse() # finding the index of element index = words.index(element) # printing the final index final_index = ...
Read MoreLinear search on list or tuples in Python
Linear search is a simple algorithm that searches for an element by checking each item in a sequence from start to end. In Python, we can implement linear search for both lists and tuples using the same approach since both are iterable sequences. A linear search starts from the first element and continues until it finds the target element or reaches the end of the sequence. It's the most straightforward searching algorithm with O(n) time complexity. How Linear Search Works The algorithm follows these steps: Start from the first element of the list or tuple ...
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