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Python Articles
Page 830 of 852
How to download Google Images using Python
Google offers many python packages which minimize the effort to write python code to get data from google services. One such package is google images download. It takes in the key words as parameters and locates the images with those keywords.ExampleIn the below example we limit the number of images to 5 and also allow the program to print the urls from where the files were generated.from google_images_download import google_images_download #instantiate the class response = google_images_download.googleimagesdownload() arguments = {"keywords":"lilly, hills", "limit":5, "print_urls":True} paths = response.download(arguments) #print complete paths to the downloaded images print(paths)OutputRunning the above code gives us the following ...
Read MoreHow to clear screen in python?
In Python sometimes we have link the output and we want to clear the screen in the cell prompt we can clear the screen by pressing Control + l . But there are situations when we need to clear the screen programmatically depending on the amount of output from the program and how we want to format the output. In such case we need to put some commands in the python script which will clear the screen as and when needed by the program.We need the system() from the OS module of python to clear up the screen. For different ...
Read MoreFinding Mean, Median, Mode in Python without Libraries
Mean, Median and Mode are very frequently used statistical functions in data analysis. Though there are some python libraries.Finding MeanMean of a list of numbers is also called average of the numbers. It is found by taking the sum of all the numbers and dividing it with the count of numbers. In the below example we apply the sum() function to get the sum of the numbers and th elen() function to get the count of numbers.Examplenum_list = [21, 11, 19, 3, 11, 5] # FInd sum of the numbers num_sum = sum(num_list) #divide the sum with length of the ...
Read MoreFind the k most frequent words from data set in Python
If there is a need to find 10 most frequent words in a data set, python can help us find it using the collections module. The collections module has a counter class which gives the count of the words after we supply a list of words to it. We also use the most_common method to find out the number of such words as needed by the program input.ExamplesIn the below example we take a paragraph, and then first create a list of words applying split(). We will then apply the counter() to find the count of all the words. Finally ...
Read MoreFind all the numbers in a string using regular expression in Python
Extracting only the numbers from a text is a very common requirement in python data analytics. It is done easily using the python regular expression library. This library helps us define the patterns for digits which can be extracted as substrings.ExamplesIn the below example we use the function findall() from the re module. The parameters to these function are the pattern which we want to extract and the string from which we want to extract. Please note with below example we get only the digits and not the decimal points or the negative signs.import re str=input("Enter a String with numbers: ...
Read MoreLogic Gates in Python
In this article, we will learn about Logic Gates in Python. Let’s look at each of the logic gates in Python in detail with some easy examples.All of us are quite familiar while implementing logic gates in the processing of electrical signals and are widely used in the electrical and electronics industry. They are used in the diodes and transistors so that we can design by proper alignment of these electronic devices. In this article we will learn about the implementation of some basic gates ‘and‘, ‘or‘ ,’not‘ , ‘nand‘ ,’nor‘ in Python 3.x or earlier.These gates can be implemented ...
Read MoreList comprehension and ord() in Python to remove all characters other than alphabets
In this article, we will learn about a program in which we can remove an all characters other than alphabets using the concept of list comprehension and ord() function in Python 3.x. Or earlier.Algorithm1.We Traverse the given string to check the charater. 2.Selection of characters is done which lie in the range of either [a-z] or [A-Z]. 3.Using the join function we print all the characters which pass the test together.Exampledef remchar(input): # checking uppercase and lowercase characters final = [ch for ch in input if (ord(ch) in range(ord('a'), ord('z')+1, 1)) or (ord(ch) in range(ord('A'), ord('Z')+1, 1))] return ...
Read MoreCount frequencies of all elements in array in Python using collections module
As python allows duplicate elements in a list we can have one element present multiple Times. The frequency of elements in a list indicates how many times an element occurs in a list. In this article we use the Counter function of the collections module to find out the frequency of each item in a list.SyntaxSyntax: Counter(list) Where list is an iterable in pythonExampleThe below code uses the Counter() to keep track of frequency and items() to iterate over each item in the result of counter function for printing in a formatted manner.from collections import Counter list = ['Mon', 'Tue', ...
Read MoreCount distinct elements in an array in Python
In a list in Python we may have duplicate elements. When we count the length of the list we get the total length including the duplicate elements. But in this article we will see how to get the total count of the distinct elements or unique elements in a list.ExampleIn the below example we use the counter() from the collections module. In this module a Counter is a dict subclass for counting hashable objects. Counter is an unordered collection where elements are stored as dictionary keys and their counts are stored as dictionary values. So from the original list we ...
Read MoreBackward iteration in Python
Sometimes we need to go through the elements of a list in backward order. To achieve this we need to read the last element first and then the last but one and so on till the element at index 0. Various python programming features can be used to achieve this.Using range(N, -1, -1)We are using the range function but starting with the position -1. This value helps us read the list from the last index value also we iterate through steps of -1. In the below example we start at a position which is measured by taking the length of ...
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