Python class has two constructors. One is the init, and the other one is del. Why do you need these two and their real purpose explained? The initialization method is called __init__ while the finalization or destructor method is called __del__. Python methods with a double underscore character are for internal (not intended for direct access by the outside world) use. There are no true private methods in Python classes, but convention says that a method that begins with a single underscore is considered private, and a double underscore indicates it is internal (only to be used by the system.) Python Constructors  Init Constructor object.__init__(self[, ...]) Called after the instance has been created (by  __new__() ), but before it is returned to the caller. The arguments are those passed to the class constructor expression.  If a base class has an  __init__()  method, the derived class’s  __init__()  method, if any, must explicitly call it to ensure proper initialization of the base

Removing duplicates in List simplified using SET method. It's a simple method. Just you need SET and Print to remove duplicates. Removing duplicates is common in Data science projects. What is list A list is a collection of elements. The elements can be duplicates or non-duplicates. Today's task is to remove duplicate elements in the List. Faster way to remove list duplicates Create a List Use SET Print the result List with duplicates my_list = ['The', 'unanimous', 'Declaration', 'of', 'the', 'thirteen','united', 'States', 'of', 'America,', 'When', 'in', 'the', 'Course', 'of', 'human'] Apply set method >>> non_dupes = set(my_list) Print Final list >>> print(non_dupes) Here, if you observe, there are no duplicates. The duplicates are now removed. It displays only non-duplicate values.  Here 'the' is a duplicate value. That'

Here's a quick resolution for import datetime Python error . The reason is your .py python script name and datetime  are the same. I'll show you how this error happens and its resolution.   Here's the Resolution for ImportError I've created a script called 'datetime.py.' to check whether the minute value is 'odd' or not. During the import of my python script, I got the import error cannot import name datetime. My Script: datetime.py My script's intention is to find whether the minute value is odd or not. Python Logic from datetime import datetime odds = [ 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , 21 , 23 , 25 , 27 , 29 , 31 , 33 , 35 , 37 , 39 , 41 , 43 , 45 , 47 , 49 , 51 , 53 , 55 , 57 , 59 ] right_this_minute = datetime.today().minute if right_this_minute in odds: print ( "This minute seems a little odd." ) else : print ( "Not an odd minute." ) ImportError I have imported my datetime.py from Linux. It gives an error

Here you'll know how python counts characters in the input. This is an interview question asked recently. How to Count Vowels in Input String Below is the Interview Question Vowels = ('aeiou') You need to check any vowels are present in the input string. Vowels means 'a', 'e', 'i', 'o', 'u'. The below function checks each character of input and compares it with the Vowels. 3 Steps to Count Vowels in Input You can achieve this in three steps. 1. Create a function called 'my_vowel' (the name up to you) 2. Use Set & Intersection Method 3. Run the function 1. Created 'my_vowel' Function #!usr/bin/python #This function finds vowel counts #welcome to my function """ Optional description """ def my_vowel (a): vowels = set ( 'aeiou' ) a_1 = vowels . intersection( set (a)) # initialized the dictionary found = { 'a' : 0 , 'e' : 0 , 'i' : 0 ,

Here's Python Dictionary that explained how to lookup it using Key. Dictionary in Python is Key/Value pair. It's different from the list. The basic rule to identify; is enclosed in flower brackets ({}). Here's a demo about lookup and how to test it.  Dictionary = { 'key' : 'value', 'key: value'  }   IN THIS PAGE Python Dictionary Python Lookup How to check Lookup working or not Dictionary Example my_dict = {'name' : 'srini' , 'salary' : '100000', 'skills' : 'python' } Here, 'name' is the label. Then, : Then, 'srini' -> Value Explanation Data is enclosed in flower brackets It's an unordered list You can manipulate data (mutable) You can access the value of a particular key. So, in Python, it's called a Lookup. It's one of the best interview questions. You May Also Like :  Python Dictionary Vs List With Examples Lookup Dictionary by Key Python Lookup (a.k.a Dictionary). You

Here's is an answer to calculate the length of the repeated lists. LIST is a principle data type in Python that holds a list of values. Usually strings. List() Function the Real Usage You can do various operations with Lists. The best examples are REPEAT, APPEND, INSERT, EXTEND, COUNT. Still more you can do. Note: This question is from a test recently held by an HR company. HR firms usually ask to take an online test to filter the job-seekers. IN THIS PAGE 1. Question 2. How to Find Length Interview Question  The '* 2' says times the list is repeated. In this question, they have given '2' times. my_list = ['srini', 'seetha', 'rao'] b = len(list(list(list(list(list(my_list*2)))))) Print (b) Select Answer 1. 5 2. 6 3. 7 4. None Explanation: In the first step, the '*' says, you repeated the List two times. It confuses the test-taker since they have given multiple functions of the list(). How to get Length You can code the way I did. So

Here's logic to find Max and Min values in a List. Without using built-in Max() and Min () functions you can find Max and Min values in a List. For that matter, you need to write a user-defined function. This post is all about how to write it and run. Finding Max and Min in List You can achieve this by writing a user-defined function. Here's useful logic and steps to write it precisely. IN THIS PAGE Write a Function Execute Function Get the result Write Function You can write an user-defined function to get MAX and MIN values. In this function, I am using the max(), min() built-in functions. The other variables you can use as you wish. Below is the my actual logic. Sample Code def findmaxmin (data): ax = max (data) by = min (data) return (x,y) data = ( 109 , 98 , 88 , 7 ) (maximum, minimum) = findmaxmin (data) print ( "Maximum Marks = " , maximum) print ( "Minimum Marks = " , minimum) Created a Script Using vim editor Here as the first step, I