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Python Articles
Page 823 of 855
Writing files in the background in Python
In this tutorial, we will learn about the multi-threading in Python. It helps us to perform multiple tasks at a time. Python has a module called threading for multitasking.We see how it works by writing data to a file in the background while calculating the sum of elements in a list. Let's see the steps involved in the program.Import the threading module.Create a class by inheriting threading.Thread class.Write the file code inside the run method in the above class.Initialize the required data.Write the code to calculate the sum of numbers in a list.Example# importing the modules import threading # creating ...
Read MoreRun Length Encoding in Python
In this tutorial, we are going to learn how to create a run-length encoding in Python. Given a string return a new string containing char and frequency.For example, the string tutorialspoint will be encoded as t3u1o2r1i2a1l1s1p1n1. The order is every char+frequency. Join all of them and return. See the steps below to write the program.Write the function with the name run_length_encoding.Initialize a dictionary with OrderedDict to get an initial count of chars as 0.Iterate over every character of the string and increment the count in the dictionary.Join all the chars and their frequencies. And print it.Initialize the strings and invoke ...
Read MoreGet a google map image of specified location using Google Static Maps API in Python
Google provides a static maps API that returns a map image on our HTTP request. We can directly request for a map image with different parameters based on our need.We have to create a billing account on Google to use this API. You can go to the website for more details.Let's see the steps to get the image of a location.Import the requests module.Initialise your API Key and base URL ("https://maps.googleapis.com/maps/api/staticmap?").Initialize the city and zoom value.Update the URL with API Key, City, and Zoom value.USend an HTTP request. And write the response to a file for saving the image.pdate the ...
Read MoreFind current weather of any city using OpenWeatherMap API in Python
In this tutorial, we are going to get the weather of a city using OpenWeatherMap API. To use the OpenWeatherMap API, we have to get the API key. We will get it by creating an account on their website.Create an account and get your API Key. It's free until 60 calls per minute. You have to pay if you want more than that. For this tutorial, the free version is enough. We need requests module for the HTTP requests and JSON module to work with the response. Follow the below steps to the weather of any city.Import the requests and JSON ...
Read MoreCount all prefixes in given string with greatest frequency using Python
In this tutorial, we are going to write a program that counts and prints the words with a higher frequency of an alphabet than the second one.Take a string and two alphabets. The prefixes with a higher frequency of the first alphabet will be printed. And display the count at the end of the output.Let's see some examples.Inputstring:- apple alphabets:- p, eOutputap app appl apple 4Inputstring:- apple alphabets:- e, pOutput0Let's see the steps to write the code.Define a function and write the code in it.Initialize count to 0 and an empty string.Iterate over the string.Get the prefix using the string ...
Read MoreParsing XML with DOM APIs in Python
The Document Object Model ("DOM") is a cross-language API from the World Wide Web Consortium (W3C) for accessing and modifying XML documents.The DOM is extremely useful for random-access applications. SAX only allows you a view of one bit of the document at a time. If you are looking at one SAX element, you have no access to another.Here is the easiest way to quickly load an XML document and to create a minidom object using the xml.dom module. The minidom object provides a simple parser method that quickly creates a DOM tree from the XML file.The sample phrase calls the ...
Read MoreMultithreaded Priority Queue in Python
The Queue module allows you to create a new queue object that can hold a specific number of items. There are following methods to control the Queue −get() − The get() removes and returns an item from the queue.put() − The put adds item to a queue.qsize() − The qsize() returns the number of items that are currently in the queue.empty() − The empty( ) returns True if queue is empty; otherwise, False.full() − the full() returns True if queue is full; otherwise, False.Example#!/usr/bin/python import Queue import threading import time exitFlag = 0 class myThread (threading.Thread): def __init__(self, threadID, name, q): ...
Read MoreSending an HTML e-mail using Python
When you send a text message using Python, then all the content are treated as simple text. Even if you include HTML tags in a text message, it is displayed as simple text and HTML tags will not be formatted according to HTML syntax. But Python provides option to send an HTML message as actual HTML message.While sending an e-mail message, you can specify a Mime version, content type and character set to send an HTML e-mail.ExampleFollowing is the example to send HTML content as an e-mail. Try it once −#!/usr/bin/python import smtplib message = """From: From Person To: ...
Read MoreDisconnecting Database in Python
To disconnect Database connection, use close() method.db.close()If the connection to a database is closed by the user with the close() method, any outstanding transactions are rolled back by the DB. However, instead of depending on any of DB lower level implementation details, your application would be better off calling commit or rollback explicitly.
Read MoreCommit & RollBack Operation in Python
COMMITCommit is the operation, which gives a green signal to database to finalize the changes, and after this operation, no change can be reverted back.Here is a simple example to call commit method.db.commit()ROLLBACKIf you are not satisfied with one or more of the changes and you want to revert back those changes completely, then use rollback() method.Here is a simple example to call rollback() method.db.rollback()
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