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Articles by Niharikaa Aitam
77 articles
How to touch all the files recursively using Python?
In file system management, it's sometimes necessary to update the modification or access time of files which is commonly referred as "touching" files. This is useful in automation scripts, build systems or cache invalidation mechanisms. Python offers powerful modules such as os and pathlib to touch all files within a directory recursively. In this article, we'll explore different methods to recursively touch files using Python by ensuring each file's timestamp is refreshed as needed. Using os.walk() and os.utime() The os.walk() function generates the file names in a directory tree by walking the tree either top-down approach or bottom-up approach. It ...
Read MoreProgram to find length of longest distinct sublist in Python
A distinct sublist is a continuous portion of a list in which all the elements are different from each other. The goal is to find the maximum length of such a sublist within a given list of elements. In Python, a list is an ordered and mutable data structure in which sequence of elements are enclosed in square brackets []. The elements in a list can be of any datatype such as integer, float, string etc., and each element in a list has a unique index position which starts from 0. Using set() function The set() is a built-in function ...
Read MoreProgram to find length of longest anagram subsequence in Python
In Python, a string is immutable data structure in which sequence of characters are enclosed in double("") or single quotes(''). In some cases, we need to find the length of the longest subsequence of characters that can be rearranged to form a palindrome. This type of subsequence is referred to as a palindromic anagram subsequence. To solve this, we need to count how many characters appear an even number of times and at most one character can appear an odd number of times. An anagram is a word or phrase formed by rearranging the letters of another word or phrase ...
Read MoreProgram to return number of smaller elements at right of the given list in Python
In Python, a list is a ordered and mutable data structure where elements are enclosed in square braces []. In some scenarios, we may need to count how many elements to the right of each element in the list are smaller than it. Using Binary Search with bisect_left() Function The bisect_left() Function of the bisect method is used locate the insertion point for an element in a sorted list to maintain the list's sorted order. The insertion point returned by bisect_left() is the index where the element can be inserted without violating the sort order by placing it before any ...
Read MoreProgram to find which element occurs exactly once in Python
In Python, datastructures such as string, list etc., may contain duplicates of a value. In few scenarios, we may need to find which element appears only once while all others elements appear multiple times. Let's go through different methods to find which element occurs exactly once in Python. Using Bitwise XOR The XOR is abbrivated as Exclusive OR is a bitwise operator which returns 1 if the corresponding bits of two operands are different otherwise, it returns 0 if they are same. In Python, we can use the ^ between two operands to perform Exclusive OR operation. Example Following is ...
Read MoreProgram to find longest equivalent sublist after K increments in Python
The longest equivalent sublist after K increments is known as the longest contiguous portion of a list where we can make all the elements equal by performing at most K increment operations. Suppose we have a list of numbers called nums and k. Now, consider an operation where we can increment any one element once. If we can perform operations at most k times, we have to find the longest sub-list containing equal elements. Input Output Scenario Let's consider the following scenario, as we can increment 9 once and 6 four times to get the sublist [10, 10, 10], ...
Read MoreCheck if both halves of the string have same set of characters in Python
In Python, a string is one of the data structures that is a sequence of characters enclosed within single quotes '' or double quotes "". It is immutable, i.e., once a string is created, it cannot be changed. When we want to check if both halves of the string have the same set of characters in Python, we can follow the steps below - First, based on the length of the string, we have to split the string into two halves. Next, convert each half into a set of characters using set() function. Finally, compare the two sets using ...
Read MoreBasic calculator program using Python program
In this tutorial, we are going to build a basic calculator in Python. As we all know that a calculator will give six options to the user from which they select one option and we will perform the respective operation. Following are the arithmetic operations that we can perform using a basic calculator - Addition Subtraction Multiplication Division Floor Division Modulo Steps in Developing the Basic Calculator Following are the steps involved in creating a basic calculator in Python - Defining Arithmetic Functions First, we are defining all the arithmetic operations that can be performed by using a ...
Read MoreGenerate two output strings depending upon occurrence of character in input string in Python
In Python, a string is one of the data structures that is a sequence of characters enclosed within single quotes '' or double quotes "". It is immutable, i.e., once a string is created, it cannot be changed. When we want to generate two output strings based on character occurrence in Python, we have to follow the steps below - First, we need to initialize a dictionary or use the collections.Counter class to count the frequency of each character in the input string. Next, we have to go through the input ...
Read MoreTo print all elements in sorted order from row and column wise sorted matrix in Python
In Python, we may go through the matrices that are sorted in a particular order. A common case is a matrix where each row and each column is sorted in increasing order, and this does not mean that the entire matrix is sorted. In such cases, we need to extract all elements and print them in a fully sorted order. Row and Column-wise Sorted Matrix? A row and column-wise sorted matrix means each row is sorted from left to right, and each column is sorted from top to bottom. For example, let's consider the following matrix - matrix = ...
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