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Python Articles
Page 840 of 854
Determine the type of an image in Python?
In this section we are going to see the type of image file we have. So consider a situation, where in a directory we have hundreds of image file and we want to get all the jgeg(or any particular image file type) file type. All this we are going to do programmatically using python.Python provide library to determine the type of an image, on such library is imghdr.The python imghdr package determines the type of image contained in a file or byte stream.InstallationThere is a very much chances that if you are using python 3.6 or higher, imghdr module is ...
Read MoreWorking with PDF files in Python?
Python is a very versatile language as it provides huge set of libraries to work on different requirements. We all work on Portable Document Format (PDF) files. Python provides different ways to work with pdf files. In this we are going to use python library called PyPDF2 to work with pdf file.PyPDF2 is a pure-python PDF library capable of splitting, merging together, cropping, and transforming the pages of PDF files. It can also add custom data, viewing options, and passwords to PDF files. It can retrieve text and metadata from PDFs as well as merge entire files together.As we can ...
Read MoreLinear Regression using Python?
Linear regression is one of the simplest standard tool in machine learning to indicate if there is a positive or negative relationship between two variables.Linear regression is one of the few good tools for quick predictive analysis. In this section we are going to use python pandas package to load data and then estimate, interpret and visualize linear regression models.Before we go down further down, let’s discuss what is regression first?What is Regression?Regression is a form of predictive modelling technique which helps in creating a relationship between a dependent and independent variable.Types of RegressionLinear RegressionLogistic RegressionPolynomial RegressionStepwise RegressionWhere is Linear ...
Read MoreDetection of a specific color(blue here) using OpenCV with Python?
For many people, image processing may seem like a scary and daunting task but it is not as hard as many people thought it is. In this tutorial we’ll be doing basic color detection in openCv with python.How does color work on a computer?We represent colors on a computers by color-space or color models which basically describes range of colors as tuples of numbers.Instead of going for each color, we’ll discuss most common color-space we use .i.e. RGB(Red, Green, Blue) and HSV (Hue, Saturation, Value).RGB basically describes color as a tuple of three components. Each component can take a value ...
Read MoreTimeit in Python with Examples?
Python provides many ways to measure the time of execution for a piece of python code. One way is to use the python inbuilt time module and save the time before and after the execution of the program?Python timeitWhen some program is running, many processes also run in the background to make that code executable. The time module doesn’t count background processes execution time, however if you need precise time performance measurements timeit is the module to go for it.The timeit module runs the code approximately 1 million times (default value) and take into account the minimum amount of time ...
Read MorePython Input Methods for Competitive Programming?
In this we are going to see different ways of I/O methods for competitive programming in Python. In competitive programming it is important to read the input as fast as possible so as take advantage over others.Suppose you’re in a codeforces or similar online jude (like SPOJ) and you have to read numbers a, b, c, d and print their product. There are multiple ways to do, let’s explore them – one by oneOne way to doing it is either through list comprehension and map function.Method 1: Using a list comprehensiona, b, c, d = [int(x) for x in input().split()] ...
Read MoreOptimization Tips for Python Code?
Though we all know python is not as fast or efficient as other complied languages. However, there are many big companies which shows us that python code can handle much bigger workload which shows it’s not that slow. In this section, we are going to see some of the tips that one should keep in mind so that a correct python program runs even faster and more efficient.Tip 1: Go for built-in functionsThough we can write efficient code in python, but it’s very hard to beat built-in functions(which are written in C). Below image shows the list of python built-in ...
Read MoreAny & All in Python?
Python provides two built-ins functions for “AND” and “OR” operations are All and Any functions.Python any() functionThe any() function returns True if any item in an iterable are true, otherwise it returns False. However, if the iterable object is empty, the any () function will return False.Syntaxany(iterable)The iterable object can be a list, tuple or dictionary.Example 1>>> mylst = [ False, True, False] >>> x = any(mylst) >>> x TrueOutputOutput is True because the second item is True.Example 2Tuple – check if any item is True>>> #Tuple - check if any item is True >>> mytuple = (0, 1, 0, ...
Read Moreurllib.parse — Parse URLs into components in Python
This module provides a standard interface to break Uniform Resource Locator (URL) strings in components or to combine the components back into a URL string. It also has functions to convert a "relative URL" to an absolute URL given a "base URL."This module supports the following URL schemes -fileftpgopherhdlhttphttpsimapmailtommsnewsnntpprosperorsyncrtsprtspusftpshttpsipsipssnewssvnsvn+sshtelnetwaiswswssurlparse()This function parses a URL into six components, returning a 6-tuple. This corresponds to the general structure of a URL. Each tuple item is a string. The components are not broken up in smaller parts (for example, the network location is a single string), and % escapes are not expanded. The return ...
Read Moreipaddress - IPv4/IPv6 manipulation library in Python
Internet Protocol is currently in the process of moving from version 4 to version 6. This is necessitated because version 4 doesn’t provide enough addresses to handle the increasing number of devices with direct connections to the internet.An IPv4 address is composed of 32 bits, represented into four eight bit groups called as "octets". This is a "dotted decimal" format where each eight-bit octet can have a decimal value 0 to 255.For example: 192.168.1.1IPv4 address with CIDR notation: 192.168.1.1/24 where 24 means first three octets identify the network and last octet identifies node.An IPv6 address is 128 bits long. It ...
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