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Sometimes in a Python dictionary we may need to to filter out certain keys of the dictionary based on certain criteria. In this article we will see how to filter out keys from Python dictionary.With for and inIn this approach we put the values of the keys to be filtered in a list. Then iterate through each element of the list and check for its presence in the given dictionary. We create a resulting dictionary containing these values which are found in the dictionary.Example Live DemodictA= {'Mon':'Phy', 'Tue':'chem', 'Wed':'Math', 'Thu':'Bio'} key_list = ['Tue', 'Thu'] print("Given Dictionary:", dictA) print("Keys for filter:", ... Read More
Both abs() and fabs() represent the mathematical functions which give us the absolute value of numbers. But there is a subtle difference between both of them which we can explore in the exmaples below.ExampleThe abs() functions returns the absolute value as an integer or floating point value depending on what value was supplied dot it. But the fabs) function will always return the value as floating point irrespective of whether an integer or a floating point was supplied to it as a parameter. Live Demoimport math n = -23 print(abs(n)) print(math.fabs(n)) n = 21.4 print(abs(n)) print(math.fabs(n)) n = ... Read More
The print() function in python always creates a newline. But there is also a parameter for this function which can put other characters instead of new line at the end. In this article we will explore various options for this parameter.ExampleIn the below example we see various ways we can assign values to the end parameter and see the result from it. Live Demoprint("Welcome to ") print("Tutorialspoint") print("Welcome to ", end = ' ') print("Tutorialspoint") print("emailid", end='@') print("tutorialspoint.com")OutputRunning the above code gives us the following result −Welcome to Tutorialspoint Welcome to Tutorialspoint emailid@tutorialspoint.comRead More
Two python dictionaries may contain some common keys between them. In this article we will find how to get the difference in the keys present in two given dictionaries.With setHere we take two dictionaries and apply set function to them. Then we subtract the two sets to get the difference. We do it both ways, by subtracting second dictionary from first and next subtracting first dictionary form second. Those keys which are not common are listed in the result set.Example Live DemodictA = {'1': 'Mon', '2': 'Tue', '3': 'Wed'} print("1st Distionary:", dictA) dictB = {'3': 'Wed', '4': 'Thu', '5':'Fri'} print("1st Distionary:", ... Read More
Suppose you are given a list but we want to convert it to dictionary. Dictionary elements hold two values are called key value pair, we will use in case of value. The elements of the list become keys and non will remain a placeholder.With dictThe dict() constructor creates a dictionary in Python. So we will use it to create a dictionary. The fromkeys method is used to create the dictionary elements.Example Live DemolistA = ["Mon", "Tue", "Wed", "Thu", "Fri"] print("Given list: ", listA) res = dict.fromkeys(listA) # New List print("The list of lists:", res)OutputRunning the above code gives us ... Read More
In this tutorial, we will be discussing a program to find maximum Sum Increasing Subsequence.For this we will be provided with an array containing N integers. Our task is to pick up elements from the array adding to the maximum sum such that the elements are in sorted orderExample Live Demo#include using namespace std; //returning the maximum sum int maxSumIS(int arr[], int n) { int i, j, max = 0; int msis[n]; for ( i = 0; i < n; i++ ) msis[i] = arr[i]; for ( i = 1; i < n; ... Read More
There may be a situation when we need to convert the elements in the list into a list in itself. In other words, create a list which is nested as its elements are also lists.Using iterationThis is the novel approach in which we take each element of the list and convert it to a format of lists. We use temporary list to achieve this. Finally all these elements which are converted to lists are group together to create the required list of lists.Example Live DemolistA = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'] print("Given list:", listA) new_list = [] # Creating ... Read More
We know the arithmetic operations between different arrays happens monthly if the arrays are of equal size awesome required specific size. But there are scenarios when we can take erase of unequal size and still apply arithmetic operations on them by enhancing one of the arrays by filling array with smaller ndim prepended with '1' in its shape. So basically broadcasting and array means changing its shape to any required shape.Rules of array BoradcastingArray with smaller ndim than the other is prepended with '1' in its shape.Size in each dimension of the output shape is maximum of the input sizes ... Read More
This module provides support for maintaining a list in sorted order without having to sort the list after each insertion of new element. We will focus on two functions namely insort_left and insort_right.insort_leftThis function returns the sorted list after inserting number in the required position, if the element is already present in the list, the element is inserted at the leftmost possible position. This function takes 4 arguments, list which has to be worked with, number to insert, starting position in list to consider, ending position which has to be considered. The default value of the beginning and end position ... Read More
When we instantiate a class in Python, all its variables and functions also get inherited to the new instantiated class. But there may be e occasions when we do not want some of the variables of the parent class to be inherited by the child class. In this article, we will explore two ways to do that.Instantiation ExampleIn the below example we show how the variables are instance heated from a given class and how the variables are shared across all the instantiated classes. Live Democlass MyClass: listA= [] # Instantiate Both the classes x = MyClass() y = ... Read More