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Python Articles
Page 626 of 852
Write a program in Python to count the number of digits in a given number N
Let's suppose we have given a number N. the task is to find the total number of digits present in the number. For example, Input-1 −N = 891452Output −6Explanation − Since the given number 891452 contains 6 digits, we will return ‘6’ in this case.Input-2 −N = 0074515Output −5Explanation − Since the given number 0074515 contains 5 digits, we will print the output as 5.The approach used to solve this problemWe can solve this problem in the following way, Take input ‘n’ as the number.A function countDigits(n) takes input ‘n’ and returns the count of the digit as output.Iterate over all ...
Read MoreCount Good Meals in Python
A good meal contains exactly two different food items with a sum of deliciousness equal to a power of two. You can pick any two different foods to make a good meal.Let us suppose we have given an array of integers arr where arr[i] is the deliciousness of the ith item of food, return the number of different good meals you can make from this list.For example, Input-1 −arr[ ] = {1, 3, 5, 7, 9}Output −4Explanation − The good meals are (1, 3), (1, 7), (3, 5) and, (7, 9). Their respective sums are 4, 8, 8, and 16, ...
Read MoreBirthday Paradox in Python
The birthday paradox is a very famous problem in the section of probability.Problem Statement − There are several people at a birthday party, some are having the same birthday collision. We need to find the approximate number of people at a birthday party on the basis of having the same birthday.In the probability, we know that the chance of getting ahead is 1/2, same as if we have some coins, the chance of getting 10 heads is 1/100 or 0.001.Let us understand the concept.The chance of two people having the different birthday is $$\frac{364}{365}$$ which is $$\lgroup1-\frac{1}{365}\rgroup$$ in a Non-leap ...
Read MoreWrite a program in Python to replace all the 0’s with 5 in a given number
Given an Integer N the task is to replace all the 0’s that appear in the number with ‘5’. However, the number with leading ‘0’ cannot be replaced with ‘5’ as it remains unchanged. For example, Input-1 −N = 1007Output −1557Explanation − The given number has 2 zeros which when replaced by ‘5’ results in the output as 1557.Input-2 −N = 00105Output −155Explanation − Since the given number starts with the leading ‘0’ which can be ignored and the output after replacing the 0 in the middle with ‘5’ results the output as 155.Approach to solve this problemTo replace all ...
Read MoreMajority Element in Python
Let’s suppose we have an array of integers. The task is to find the index of a particular element in the given array. For example, Input-1 −N = 8 A[ ] = { 1, 2, 4, 3, 3, 1, 1, 5}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus the output is ‘1’.Input-2 −N = 6 A[ ] = {1, 5, 4, 4, 1, 1}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus we can return the output ‘1’.Approach to solve this problemThe given array contains ...
Read MoreHow to set window size using phantomjs and selenium webdriver in Python?
We can set window size using PhantomJS and Selenium webdriver in Python. To work with the PhantomJS, we should create a driver object of the webdriver.PhantomJS class.Then pass the path of the phantomjs.exe driver file as a parameter to the Class. Next, to set the window size, we shall use the set_window_size method and pass the dimensions as parameters to the method.To obtain the window size of the browser, we can use the get_window_size method.Syntaxdriver.set_window_size(800, 1000) print(driver.get_window_size())Examplefrom selenium import webdriver #set phantomjs.exe path driver = webdriver.PhantomJS(executable_path="C:\phantomjs.exe") driver.maximize_window() #launch URL driver.get("https://www.tutorialspoint.com/index.htm") #set new window size driver.set_window_size(800, 880) #obtain window size print(driver.get_window_size()) ...
Read MoreXMLRPC server and client modules in Python
We can create our own cross-platform, language-independent server using the XML-RPC protocol.We use the SimpleXMLRPCServer to create the SimpleXMLRPCServer instance and tell it to listen for incoming requests. Next we define some functions to be part of the service and register those functions so that the server knows how to call it.Running the ServerIn the below example we create a server using the SimpleXMLRPCServer instance and register some pre-defined as well as custom functions. Finally, we put the server into an infinite loop receiving and responding to requests.Examplefrom xmlrpc.server import SimpleXMLRPCServer from xmlrpc.server import SimpleXMLRPCRequestHandler class RequestHandler(SimpleXMLRPCRequestHandler): rpc_paths = ...
Read MorePython Code Objects
Code objects are a low-level detail of the CPython implementation. Each one represents a chunk of executable code that hasn’t yet been bound into a function. Though code objects represent some piece of executable code, they are not, by themselves, directly callable. To execute a code object, you must use the exec keyword.In the below example we see how the code objects are created for a given piece of code and what are the various attributes associated with hat code object.Example Live Democode_str = """ print("Hello Code Objects") """ # Create the code object code_obj = compile(code_str, '', 'exec') # get ...
Read MorePython a += b is not always a = a + b
If two variables are of the same data types and not iterators like list and dictionary etc, then the expressions a += b is same as a =+b gives the same result. But when n iterator is involved we can not always expect the same. Below is one of such scenario.Case of a = a +bHere we can see when we apply the expression to a list and a string expecting they will get merged, we get back an error.Examplex ='Hello ' z_list = [1, 2, 3] z_list = z_list + x print(z_list)OutputRunning the above code gives us the following ...
Read MorePython - Create Test DataSets using Sklearn
The Sklearn python library does provide sample data sets which can be used tocreate various graph plots. The usefulness of these datasets is in creating sample graphs and charts and predicting the behavior of the graph as the values changes. Also you can work on other parameters like deciding on the colours and axes etc on this sample graphs before using the actual data set.Using make_blobsIn the below example we use the sklearn library along with the matplotlib to create a scatter plot with a specific style. We choose a sample of 200 data points and also select the colour ...
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