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Articles on Trending Technologies
Technical articles with clear explanations and examples
Program to check whether we can make k palindromes from given string characters or not in Python?
Suppose we have a string s and another number k, we have to check whether we can create k palindromes using all characters in s or not.So, if the input is like s = "amledavmel" k = 2, then the output will be True, as we can make "level" and "madam".To solve this, we will follow these stepsd := a map where store each unique characters and their frequencycnt := 0for each key in d, doif d[key] is odd, thencnt := cnt + 1if cnt > k, thenreturn Falsereturn TrueLet us see the following implementation to get better understandingExamplefrom collections ...
Read MoreHow to create charts in excel using Python with openpyxl?
In this post, I will show you how to create charts in excel using Python - Openpyxl module. We will create an excel spreadsheet from scratch with Tennis players grandslam titles as the data for creating bar charts using the openpyxl module.Introduction..Microsoft office has started providing a new extension to Microsoft Excel sheets, which is .xlsx, from Office 2007 to support storing more rows and columns.This change had moved Excel sheets to a XML based file format with ZIP compression. The world is ruled by Microsoft spreadsheets, people have been using spreadsheets for various purposes and one of the use ...
Read MoreProgram to find minimum number of Fibonacci numbers to add up to n in Python?
Suppose we have a number n; we have to find the minimum number of Fibonacci numbers required to add up to n.So, if the input is like n = 20, then the output will be 3, as We can use the Fibonacci numbers [2, 5, 13] to sum to 20.To solve this, we will follow these stepsres := 0fibo := a list with values [1, 1]while last element of fibo n, dodelete last element from fibon := n - last element of fibores := res + 1return resLet us see the following implementation to get better understandingExampleclass Solution: ...
Read MoreHow to interpolate data values into strings in Python?
We can interpolate data values into strings using various formats. We can use this to dedug code, produce reports, forms, and other outputs. In this topic, We will see three ways of formatting strings and how to interpolate data values into strings.Python has three ways of formatting strings:% - old school (supported in Python 2 and 3)() - new style (Python 2.6 and up){} - f-strings (Python 3.6 and up)Old style: %The old style of string formatting has the form format_string % data. The format strings are nothing but interpolation sequences.syntaxdescription%sstring%ddecimal%xhexa-int%ooctal-int%fdecimal-float%eexponential-float%gdecimal or exponential-float%%literal %# printing integer with % style type. ...
Read MoreHow to restrict argument values using choice options in Python?
Introduction..Assume you are asked to code a program to accept the number of tennis grandslam titles from the user and process them. We already know, Federer and Nadal share the maximum grandslam titles in Tennis which is 20 (As of 2020) while the minimum is 0, lot of players are still fighting to get their first grandslam title.Let us create a program to accept the titles.Note - Execute the program from terminal.Exampleimport argparse def get_args(): """ Function : get_args parameters used in .add_argument 1. metavar - Provide a hint to the user about the data type. - By default, ...
Read MoreProgram to count minimum number of operations required to make numbers non coprime in Python?
Suppose we have two numbers A and B. Now in each operation, we can select any one of the number and increment it by 1 or decrement it by 1. We have to find the minimum number of operations we need such that the greatest common divisor between A and B is not 1.So, if the input is like A = 8, B = 9, then the output will be 1, as we can select 9 then increase it to 10, so 8 and 10 are not coprime.To solve this, we will follow these steps:if gcd of a and b ...
Read MoreProgram to remove all nodes with only one child from a binary tree in Python?
Suppose we have a binary tree root; we have to remove all nodes with only one child.So, if the input is likethen the output will beTo solve this, we will follow these steps:Define a method called solve(), this will take tree rootif root is null, thenreturn rootif left of root is null and right of root is null, thenreturn rootif left of root is null, thenreturn solve(right of root)if right of root is null, thenreturn solve(left of root)left of root := solve(left of root)right of root := solve(right of root)return rootExampleclass TreeNode: def __init__(self, data, left = None, right ...
Read MoreProgram to find length of concatenated string of unique characters in Python?
Suppose we have a list of strings words. We have to make a string that is constructed by concatenating a subsequence of words such that each letter is unique. We have to finally find the length of the longest such concatenation.So, if the input is like words = ["xyz", "xyw", "wab", "cde"], then the output will be 9, as we cannot pick any word since they contain duplicate characters.To solve this, we will follow these stepsans := 0Define a function recur() . This will take i:= 0, cur:= blank stringif i is same as size of words , then ...
Read MoreProgram to convert linked list by alternating nodes from front and back in Python
Suppose we have a singly linked list, we have to rearrange it such that we take: the last node, and then the first node, and then the second last node, and then the second node, and so on.So, if the input is like [1, 2, 3, 4, 5, 6, 7, 8, 9], then the output will be [9, 1, 8, 2, 7, 3, 6, 4, 5, ]To solve this, we will follow these steps:c := nodel := a new listwhile c is not-null, doinsert value of c at the end of lc := next of cc := nodewhile c is ...
Read MoreHow to select subsets of data In SQL Query Style in Pandas?
IntroductionIn this post, I will show you how to perform Data Analysis with SQL style filtering with Pandas. Most of the corporate company’s data are stored in databases that require SQL to retrieve and manipulate it. For instance, there are companies like Oracle, IBM, Microsoft having their own databases with their own SQL implementations.Data scientists have to deal with SQL at some stage of their career as the data is not always stored in CSV files. I personally prefer to use Oracle, as the majority of my company’s data is stored in Oracle.Scenario – 1 Suppose we are given a ...
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