In this article we will see how to get some selected elements out of a Python list. So we need to design some condition and only the elements satisfying that condition should be picked and their count to be printed.Wit in and sumIn this approach we use in condition to pick the elements and use some to get their count. 1 is used if the element is present else 0 is used for the result of in condition.Example Live DemoAlist = ['Mon', 'Wed', 'Mon', 'Tue', 'Thu'] # Given list print("Given list:", Alist) cnt = sum(1 for i in Alist if i ... Read More

In this article we are given a list and a string. We are required to find how many times the given string is present as an element in the list.With CounterThe counter function from collections module will give us the count of each element present in the list. From the counting result we can extract only that account fair the index matches with the value of the element we are searching for.Example Live Demofrom collections import Counter Alist = ['Mon', 'Wed', 'Mon', 'Tue', 'Thu'] elem = 'Mon' # Given list and element print("Given list:", Alist) print("Given element:", elem) cnt = Counter(Alist) ... Read More

We are given a string and a character. We want to find out how many times the given character is repeated in a given string.With range and lenWe design a for loop to match the character with every character present in the string which are accessed using index. The range and len function helps us determine how many times the matching has to be done when moving from left to right of the string.Example Live DemoAstr = "How do you do" char = 'o' # Given String and Character print("Given String:", Astr) print("Given Character:", char) res = 0 for i in ... Read More

We have a list and tuple. We match the elements of the list with the elements of the tuple and account the number of elements in the table matching with the elements of the list.With CounterWe use the counter function from collections to get the count of every element in the tuple. Again design a for and in condition find those elements which are present in the the list and part of the counting result from the tuple.Example Live Demofrom collections import Counter Atup = ('Mon', 'Wed', 'Mon', 'Tue', 'Thu') Alist = ['Mon', 'Thu'] # Given Tuple and list print("Given tuple ... Read More

Suppose we have a text. We have to find the largest possible k such that there exists a[1], a[2], ..., a[k] such that: Each a[i] is a non-empty string; Their concatenation a[1] + a[2] + ... + a[k] is equal to the given text; For all i in range 1 to k, a[i] = a[{k+1 - i}].So, if the input is like "antaprezatepzapreanta", then the output will be 11, because we can split it like "(a)(nt)(a)(pre)(za)(tpe)(za)(pre)(a)(nt)(a)".To solve this, we will follow these steps −start := 0, end := length of text - 1initialize temp1 and temp2 with empty stringsans = ... Read More

We are given a Dictionary in which the values from the key value pair itself is a list. In this article we will see a how to count the number of items in this list which are present as values in the dictionary.With isinstanceHindi suppose we use isinstance function to find out if the value of the dictionary is a list. Then we increment a count variable whenever isinstance returns true.Example Live Demo# defining the dictionary Adict = {'Days': ["Mon", "Tue", "wed", "Thu"],    'time': "2 pm",    'Subjects':["Phy", "Chem", "Maths", "Bio"]    } print("Given dictionary:", Adict) count = 0 # ... Read More

Suppose for a project we have a list of required skills called req_skills, and a list of people. Here i-th people people[i] contains a list of skills that person has.Now suppose a sufficient team is defined as a set of people such that for every required skill in req_skills, there is at least one person in the team who has that skill. We can represent these teams by the index of each person: As an example suppose team is [0, 1, 3] this represents the people with skills people[0], people[1], and people[3].We have to find the team of the smallest ... Read More

Given a string of characters let's analyse how many of the characters are vowels.With setWe first find out all the individual and unique characters and then test if they are present in the string representing the vowels.Example Live DemostringA = "Tutorialspoint is best" print("Given String: ", stringA) vowels = "AaEeIiOoUu" # Get vowels res = set([each for each in stringA if each in vowels]) print("The vlowels present in the string: ", res)OutputRunning the above code gives us the following result −Given String: Tutorialspoint is best The vlowels present in the string: {'e', 'i', 'a', 'o', 'u'}with fromkeysThis function enables to extract ... Read More

Here we have a scenario where if string is presented which has elements in it making it a list. But those elements can also represent a key-value pair making it dictionary. In this article we will see how to take such a list string and make it a dictionary.With split and slicingIn this approach we use the split function to separate the elements as key value pair and also use slicing to convert the key value pairs into a dictionary format.Example Live DemostringA = '[Mon:3, Tue:5, Fri:11]' # Given string print("Given string : ", stringA) # Type check print(type(stringA)) # using ... Read More

Sometimes we can have a list containing strings but the strings themselves are numbers and closing quotes. In such a list we want to convert the string elements into actual integers.With int()The int function takes in parameters and converts it to integers if it is already a number. So we design a for loop to go through each element of the list and apply the in function. We store the final result into a new list.Example Live DemolistA = ['5', '2', '-43', '23'] # Given list print("Given list with strings : ", listA) # using int res = [int(i) for i ... Read More