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Python Articles
Page 835 of 854
When to use yield instead of return in Python?
In short, whenever control reach the return statement in your program, the execution of the program is terminated and the remaining statements will not executed.However, in case of yield, whenever control reach the yield statement in your program, the execution of your program is paused and later we can continue other statements in function.Let’s understand both the statements in detail.YieldUsing yield statement in a function makes the function a generator function which can be used in a loop. When the function is running and the yield statement exeucutes, the value after the yield is passed back to the loop that ...
Read MorePython program to Count words in a given string?
Lets suppose we have a ‘string’ and the ‘word’ and we need to find the count of occurence of this word in our string using python. This is what we are going to do in this section, count the number of word in a given string and print it.Count the number of words in a given stringMethod 1: Using for loop#Method 1: Using for looptest_stirng = input("String to search is : ") total = 1 for i in range(len(test_stirng)): if(test_stirng[i] == ' ' or test_stirng == '' or test_stirng == '\t'): total = total + ...
Read MoreOpenCV Python Program to blur an image?
OpenCV is one of the best python package for image processing. Also like signals carry noise attached to it, images too contain different types of noise mainly from the source itself (Camera sensor). Python OpenCV package provides ways for image smoothing also called blurring. This is what we are going to do in this section. One of the common technique is using Gaussian filter (Gf) for image blurring. With this, any sharp edges in images are smoothed while minimizing too much blurring.Syntaxcv.GaussianBlur(src, ksize, sigmaX[, dst[, sigmaY[, borderType=BORDER_DEFAULT]]] )Where−src – input imagedst – output imageksize – Gaussian kernel size[ height width]. If ksize ...
Read MoreMathematical Functions in Python?
From doing simple to complex mathematical operations(like trigonometric, logarithmic operations etc) in python we may need to use the math() module.The python math module is used to access mathematical functions. All methods of math() function are used for integer or real type objects but not for complex numbers.To use this function, we need to import it in our codeimport mathConstantsWe use these constants for calculation in python -ConstantsDescriptionsPiReturn the value of pi: 3.141592EReturn the value of natural base e. e is 0.718282tauReturns the value of tau. tau = 6.283185infReturns the infinitenanNot a number typeNumbers and Numeric RepresentationPython provides different functions ...
Read MoreNZEC error in Python?
NZEC is non-zero exit code.Exit codes are codes (number) return by running program to operating system upon either their successfully termination (Exit code 0) or failed termination due to error (Non zero exit code).As python or Java programming language supports exception handling, we can use exception handling using try-catch blocks to catch this error.NZEC error is a runtime error and occurs mostly when negative array index is accesed or the program which we have written is utilizing more memory space than the allocated memory for our program to run.In python Exception class is the super class of all the errors ...
Read MoreWhatsapp using Python?
In this section we are going to create a Whatsapp chatbots, but unlike few other chatbots for twitter or facebook, whatsapp chatbots don’t run on the platform directly because of whatsapp’s policies.But there is a way to get is done, using selenium, a very smart package in python with which developer’s can automate the browser’s activity. With this we can make use of whatsapp-web through the browser.RequirementsWe need three basic things to get things done: Selenium.We can install selenium very easily using pip, just run below command on your terminal −$pip install seleniumChrome/firefox or any other webdriver.As I using chrome ...
Read MoreAccess to the underlying platform's identifying data in Python
Functions in the platform module help us probe the underlying platform’s hardware, operating system, and interpreter version information.architecture()This function queries the given executable (defaults to the Python interpreter executable) for various architecture information.>>> import platform >>> platform.architecture() ('64bit', '')machine()This function returns the machine type, e.g. 'i386'. An empty string is returned if the value cannot be determined.>>> platform.machine() 'x86_64'node()This function returns the computer’s network name.>>> platform.node() 'malhar-ubuntu'platform(aliased=0, terse=0)This function returns a single string identifying the underlying platform.>>> platform.platform() 'Linux-4.13.0-46-generic-x86_64-with-debian-stretch-sid'processor()This function returns the (real) processor name.>>> platform.processor() 'x86_64'python_build()This function returns a tuple (buildno, builddate)>>> platform.python_build() ('default', 'Oct 13 2017 12:02:49')python_compiler()This function ...
Read MorePython program to Rearrange a string so that all same characters become d distance away
Given a non-empty string str and an integer k , rearrange the string such that the same characters are at least distance k from each other.All input strings are given in lowercase letters. If it is not possible to rearrange the string, return an empty string "".Example 1:str = “tutorialspoint”, k = 3 Answer: “tiotiotalnprsu”The same characters are at least 3 character distance apart.str = "aabbcc", k = 3 Answer: "abcabc" The same characters are at least 3 character distance apart.Example 2str = "aaabc", k = 3 Answer: "" It is not possible to rearrange the string.Example 3:str = "aaadbbcc", k = ...
Read MorePermutation and Combination in Python?
In this section, we are going to learn how to find permutation and combination of a given sequence using python programming language.One of the key advantage of python over other programming language is that it comes with huge set of libraries with it.We are going to use python inbuilt package to find permutation and combinations of a given sequence.Algorithm to find the Permutation and combinationStep 1 : Import required package. First step is to import the required package, as we are going to use itertools package, so we just import it using.>>> import itertools >>>Step 2: Get all permutation & combination ...
Read MoreLine detection in python with OpenCV?
In this post, we are going to learn, how to detect lines in an image, with the help of a technique called Hough transform.Hough transform?Hough transform is a feature extraction method to detect any simple shape, if you can represent that shape in mathematical form. It somehow manage to detect the shape even if it is broken or distorted a little bit. We will see how it works for a line.A “simple” shape is one that can be represented by only a few parameters. For example, a line can be represented by two parameters only (slope, intercept) and a circle ...
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