Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
In order to sort in Java as we know we can use either Comparable or Comparator interfaces in which we could also define our custom logic to sort.One of the approach to sort is to add the entity in TreeSet or TreeMap which would sort the entries as internally they also uses the comparable interface. Now String class in Java internally implements comparable interface so whenever we add string to a tree set or map it uses comparable logic of string class and sort the input entry strings.But String buffer do not have the implementation of comparable interface so ... Read More
In the collections there are some container datatypes, which are alternatives to python’s general purpose built-in containers like dict, list, set etc.Some of the containers are −Sr.No.Container & Description1namedtuple()Used to create tuple subclass with the name field2dequeQueue using list type data3CounterSubclass of dict to count the hash-table objects4ChainMapUsed to create single view of multiple mappings5OrderedDictSubclass of dict, where data are added in ordered manner6UserListWrapper for list to easier access.To use this module, we should import it using −import collectionsDeque ObjectThe Deque is basically a generalization of stack and queue structure, where it is initialized from left to right. It uses ... Read More
Here we are using regular expression package for extracting email-id from the URL-text file. Given the URL- text file. Using regular expression package we define the pattern of email-id then use findall() function, using this method to check the text which will match with this pattern. Input text= Please contact us at contact@tutorialspoint.com for further information."+\ " You can also give feedback at feedback@tutorialspoint.com" Output ['contact@tutorialspoint.com ', 'feedback@tutorialspoint.com'] Example code import re my_text = "Please contact us at contact@tutorialspoint.com for further information."+\ " You can also give feedback at feedback@tutorialspoint.com" my_emails = re.findall(r"[a-z0-9\.\-+_]+@[a-z0-9\.\-+_]+\.[a-z]+", ... Read More
The FILTER_VALIDATE_IP constant validates an IP address. Flags FILTER_FLAG_IPV4 − The value must be a valid IPv4 address FILTER_FLAG_IPV6 − The value must be a valid IPv6 address FILTER_FLAG_NO_PRIV_RANGE − The value must not be within a private range FILTER_FLAG_NO_RES_RANGE − The value must not be within a reserved range Return The FILTER_VALIDATE_IP constant does not return anything. Example Live Demo The following is the output. Invalid IP address! Let us see another example. Live Demo Here is the output. Valid IP address!
string keyword Use the string keyword to declare a string variable. The string keyword is an alias for the System.String class. For example. string name; name = "Tom Hanks"; Another example. string [] array={ "Hello", "From", "Tutorials", "Point" }; char keyword The char keyword is used to set array of characters. For example. char[] ch = new char[2]; ch[0] = 'A'; // Character literal ch[1] = 'B'; // Character literal Another example. char []letters= { 'H', 'e', 'l', 'l','o' };
Here we used anonymous (lambda) function inside the map() built-in function. In Python, anonymous function is defined without name, its defined using lambda keyword. Algorithm Step 1: input n Step 2: input p Step 3: use anonymous function. Step 4: display result. Example Code # To display the powers of any number using anonymous function n = int(input("Enter how many terms want to display??")) p = int(input("Enter the number want to calculate power ::")) # use anonymous function cal = list(map(lambda i: p ** i, range(n))) # display the result print("The total terms is ::>", ... Read More
To study robotics, you must have a degree in engineering. To make a career in this profession, you should acquire the knowledge of the related fields like electronics, mechanics, and computer science.
The FILTER_VALIDATE_REGEXP constant validates a value against a Perl-compatible regular expression. Options regexp − The regular expression to validate against. Return The FILTER_VALIDATE_REGEXP constant does not return anything. Example Live Demo The following is the output. Matched String!
Python provides sum function for calculating n number of element. Here we use this function and then calculate average. Algorithm Step 1: input “size of the list” Step 2: input “Element” Step 3: using sum function calculate summation of all numbers. Step 4: calculate average. Example code # Average of a list A=list() n=int(input("Enter the size of the List ::")) print("Enter the number ::") for i in range(int(n)): k=int(input("")) A.append(int(k)) sm=sum(A) avg=sm/n print("SUM = ",sm) print("AVERAGE = ",avg) Output Enter the size of the List ::5 Enter the number:: 10 20 30 40 50 SUM = 150 AVERAGE = 30.0
The heap data structures can be used to represents a priority queue. In python it is available into the heapq module. Here it creates a min-heap. So when the priority is 1, it represents the highest priority. When new elements are inserted, the heap structure updates. To use this module, we should import it using − import heapq There are some heap related operations. These are − Method heapq.heapify(iterable) It is used to convert an iterable dataset to heap data structure. Method heapq.heappush(heap, element) This method is used to insert the element into the heap. After ... Read More