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Python Articles
Page 42 of 852
Write a Python program to remove a certain length substring from a given string
We need to write a Python program which will remove a certain substring from a given stringAlgorithmStep 1: Define a string. Step 2: Use the replace function to remove the substring from the given string.Example Codeoriginal_string = "C++ is a object oriented programming language"modified_string = original_string.replace("object oriented", "")print(modified_string)OutputC++ is a programming languageExplanationThe in-build Python replace() function takes the following parameters:Oldstring: The string which you want to removeNewstring: The new string you want to replace in place of the oldstringCount: Optional. Number of times you want to replace the oldstring with the newstring
Read MorePython program to display various datetime formats
The datetime module supplies classes for manipulating dates and time. We will display different formats like day of the week, week number, day of the year, etc.AlgorithmStep 1: Import datetime. Step 2: Print day of the week. Step 3: Print week number. Step 4: Print day of the year.Example Codeimport datetime print("Day of the week: ", datetime.date.today().strftime("%A")) print("Week number: ", datetime.date.today().strftime("%W")) print("Day of the year: ", datetime.date.today().strftime("%j"))OutputDay of the week: Sunday Week number: 06 Day of the year: 045ExplanationThe arguments of the strftime() function are explained below:%A: Weekday's full name (Example: 'Monday')%W: Week number of the year with sunday ...
Read MoreFind maximum length sub-list in a nested list in Python
we often deal with nested lists when doing data analysis in python. In this article, we will see how to find out the longest list among the elements in a nested list and then print this along with its length.Using lambda and mapWe declare a nested list and give it as input to the lambda function along with its length. Finally, we apply the max function to get the list with maximum length as well as the length of such list.Exampledef longest(lst): longestList = max(lst, key = lambda i: len(i)) maxLength = max(map(len, listA)) return longestList, maxLength ...
Read MorePython a += b is not always a = a + b
If two variables are of the same data types and not iterators like list and dictionary etc, then the expressions a += b is same as a =+b gives the same result. But when n iterator is involved we can not always expect the same. Below is one of such scenario.Case of a = a +bHere we can see when we apply the expression to a list and a string expecting they will get merged, we get back an error.Examplex ='Hello ' z_list = [1, 2, 3] z_list = z_list + x print(z_list)OutputRunning the above code gives us the following ...
Read MorePython Code Objects
Code objects are a low-level detail of the CPython implementation. Each one represents a chunk of executable code that hasn’t yet been bound into a function. Though code objects represent some piece of executable code, they are not, by themselves, directly callable. To execute a code object, you must use the exec keyword.In the below example we see how the code objects are created for a given piece of code and what are the various attributes associated with hat code object.Examplecode_str = """ print("Hello Code Objects") """ # Create the code object code_obj = compile(code_str, '', 'exec') # get the ...
Read MoreBirthday Paradox in Python
The birthday paradox is a very famous problem in the section of probability.Problem Statement − There are several people at a birthday party, some are having the same birthday collision. We need to find the approximate number of people at a birthday party on the basis of having the same birthday.In the probability, we know that the chance of getting ahead is 1/2, same as if we have some coins, the chance of getting 10 heads is 1/100 or 0.001.Let us understand the concept.The chance of two people having the different birthday is $$\frac{364}{365}$$ which is $$\lgroup1-\frac{1}{365}\rgroup$$ in a Non-leap ...
Read MoreWrite a program in Python to count the number of digits in a given number N
Let's suppose we have given a number N. the task is to find the total number of digits present in the number. For example, Input-1 −N = 891452Output −6Explanation − Since the given number 891452 contains 6 digits, we will return ‘6’ in this case.Input-2 −N = 0074515Output −5Explanation − Since the given number 0074515 contains 5 digits, we will print the output as 5.The approach used to solve this problemWe can solve this problem in the following way, Take input ‘n’ as the number.A function countDigits(n) takes input ‘n’ and returns the count of the digit as output.Iterate over all ...
Read MoreMajority Element in Python
Let’s suppose we have an array of integers. The task is to find the index of a particular element in the given array. For example, Input-1 −N = 8 A[ ] = { 1, 2, 4, 3, 3, 1, 1, 5}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus the output is ‘1’.Input-2 −N = 6 A[ ] = {1, 5, 4, 4, 1, 1}Output −1Explanation − In the given array of integers, the most appearing number is ‘1’. Thus we can return the output ‘1’.Approach to solve this problemThe given array contains ...
Read MoreMake three numbers Zero in Python
Let us suppose we have three numbers. The task is to count the total number of optimal steps to make all these numbers '0'.For ExampleInput-1:a = 4 b = 4 c = 6Output:7Explanation:The total number of optimal steps to make all the numbers '0' is, (4, 4, 6)Removing '1' from 1st and 2nd number = (3, 3, 6)Removing '1' from 1st and 3rd number = (2, 3, 5)Removing '1' from 1st and 3rd number = (1 ,3, 4)Removing '1' from 1st and 3rd number = (0 ,3 ,3)Removing '1' from 2nd and 3rd number = (0 ,2, 2)Removing '1' from ...
Read MoreBalanced Binary Tree in Python
In a binary tree, each node contains two children, i.e left child and right child. Let us suppose we have a binary tree and we need to check if the tree is balanced or not. A Binary tree is said to be balanced if the difference of height of left subtree and right subtree is less than or equal to '1'.ExampleInput-1: Output:TrueExplanation:The given binary tree is [1, 2, 3, NULL, NULL, 6, 7]. The height difference of its left subtree and right subtree is equal to '1', thus it is a height Balanced tree.Input-2: Output:FalseExplanation:The given ...
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