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In this article, we will learn about the iintersection_update() in Python to find out common elements in n arrays.The problem is that we are given an array containing lists, find all common elements in given arrays?Algorithm1.Initializingres with the first list inside the array 2.Iterating through the array containing lists 3.Updating the res list by applying intersection_update() function to check the common elements. 4.Finally returning the list and display the output by the help of the print statement.Now let’s take a look at its implementationExampledef commonEle(arr): # initialize res with set(arr[0]) res = set(arr[0]) # new value will get ... Read More
The append() and extend() functions are used with the python list to increase its number of elements. But the two have different behaviors as shown below.append()Syntax: list_name.append(‘value’) It takes only one argument.This function appends the incoming element to the end of the list as a single new element. Even if the incoming element is itself a list, it will increase the count of the original list by only one.Examplelist = ['Mon', 'Tue', 'Wed' ] print("Existing list", list) # Append an element list.append('Thu') print("Appended one element: ", list) # Append a list list.append(['Fri', 'Sat']) print("Appended a list: ", list)OutputRunning the ... Read More
In Pandas a DataFrame is a two-dimensional data structure, i.e., data is aligned in a tabular fashion in rows and columns. We can create a DataFrame using list, dict, series and another DataFrame. But when we want to add a new row to an already created DataFrame, it is achieved through a in-built method like append which add it at the end of the DataFrame. In this article we will find ways to add the new row DataFrame at the top of the DataFrame using some tricks involving the index of the elements in the DataFrame.ExampleLet's first create a new ... Read More
In this article, we will learn about the intersection of two arrays in Python with the help of Lambda expression and filter function.The problem is that we are given two arrays we have to find out common elements in both of them.Algorithm1. Declaring an intersection function with two arguments. 2. Now we use the lambda expression to create an inline function for selection of elements with the help of filter function checking that element is contained in both the list or not. 3. Finally, we convert all the common elements in the form of a list by the help of ... Read More
In this article, we will learn about some of the inplace operators available in Python 3.x. Or earlier.Python provides methods to perform inplace operations, i.e assignment and computation simultaneously using in a single statement with the help of “operator” module. Here we will discuss about ixor(), iand(), ipow() functions .ixor()This function allows us to assign and xor current value. This operation behaves like “a^=b” operation. Assigning can’t be performed in case of immutable data types, such as strings and tuples.Exampleimport operator as op # using ixor() to xor int1 = op.ixor(786, 12); # displaying value print ("The value ... Read More
In this article, we will learn about how we can initialize matrix using two dimensional list in Python 3.x. Or earlier.Let’s see the intuitive way to initialize a matrix that only python language offers. Here we take advantage of List comprehension. we initialise the inner list and then extend to multiple rows using the list comprehension.Example# input the number of rows N = 3 # input the number of columns M = 3 # initializing the matrix res = [ [ i*j for i in range(N) ] for j in range(M) ] # printing the matrix on screen row ... Read More
In this article, we will learn about increment and decrement operators in Python 3.x. Or earlier. In other languages we have pre and post increment and decrement (++ --) operators.In Python we don’t have any such operators . But we can implement these operators in the form as dicussed in example below.Examplex=786 x=x+1 print(x) x+=1 print(x) x=x-1 print(x) x-=1 print(x)Output787 788 787 786Other languages have for loops which uses increment and decrement operators. Python offers for loop which has a range function having default increment value “1” set. We can also specify our increment count as ... Read More
In this article, we will learn about the 4 inbuilt data structures in python namely Lists, Dictionaries, Tuples & Sets.ListsA list is an ordered sequence of elements. It is a non-scalar data structure and mutable in nature. A list can contain distinct data types in contrast to arrays storing elements belonging to the same data types.Lists can be accessed by the help of the index by enclosing index within square brackets.Now let’s see an illustration to understand list better.Examplelis=['tutorialspoint', 786, 34.56, 2+3j] # displaying element of list for i in lis: print(i) # adding an elements at end of ... Read More
In this article, we will learn about the usage and implementation of id() function in Python 3.x. Or earlier. It is present in Python Standard Library and is automatically imported before executing the code.Syntax: id ()Return value: Identity value of type The function accepts exactly one argument i.e. the name of the entity whose id has to be used. This id is unique for every entity until they are referring to the same data.Id’s are merely address in the memory locations and is used internally in Python.Example Codestr_1 = "Tutorials" print(id(str_1)) str_2 = "Tutorials" print(id(str_2)) # This will return True ... Read More
Compatibility of Firefox with Selenium has always been a pain area. Before Selenium3, Firefox used to be the default browser for Selenium. But after Selenium3, by using GeckoDriver explicitly, we can initialize the script in FireFox.FireFox was fully supported only in previous versions i.e. v47 and earlier. Selenium WebDriver version 2.53 is not compatible with Mozilla FireFox version 47.0+. After v47.0, FireFox is provided with GeckoDriver. GeckoDriver is a proxy for using W3C WebDriver-compatible clients to interact with gecko-based browsers i.e. Mozilla FireFox.GeckoDriver acts a link between Selenium WebDriver tests and Mozilla FireFox Browser. It is a web browser engine ... Read More