HackerRank Python Solution - Built-Ins - eval()

• The eval() expression is a very powerful built-in function of Python. It helps in evaluating an expression. The expression can be a Python statement or a code object.
• For example:

>>> eval("9 + 5")
14
>>> x = 2
>>> eval("x + 3")
5

• Here, eval() can also be used to work with Python keywords or defined functions and variables. These would normally be stored as strings.

HackerRank Python Solution - Built-Ins - Input()

input():

• In Python, the expression input() is equivalent to eval(raw _input(prompt)).

Code:

 

>>> input()  
1+2
3
>>> company = 'HackerRank'
>>> website = 'www.hackerrank.com'
>>> input()
'The company name: '+company+' and website: '+website
'The company name: HackerRank and website: www.hackerrank.com'

HackerRank Python Solution - Built-Ins - Zipped!

Zip([iterable, ...]):

• This function returns a list of tuples. The i^th tuple contains the i^th element from each of the argument sequences or iterables.
• If the argument sequences are of unequal lengths, then the returned list is truncated to the length of the shortest argument sequence.

Sample Code:

>>> print zip([1,2,3,4,5,6],'Hacker')
[(1, 'H'), (2, 'a'), (3, 'c'), (4, 'k'), (5, 'e'), (6, 'r')]
>>> 
>>> print zip([1,2,3,4,5,6],[0,9,8,7,6,5,4,3,2,1])
[(1, 0), (2, 9), (3, 8), (4, 7), (5, 6), (6, 5)]
>>> 
>>> A = [1,2,3]
>>> B = [6,5,4]
>>> C = [7,8,9]
>>> X = [A] + [B] + [C]
>>> 
>>> print zip(*X)
[(1, 6, 7), (2, 5, 8), (3, 4, 9)]

Microsoft Azure Fundamentals AZ-900 Exam Practice Test

Microsoft Azure Fundamental AZ-900 Topic:

• Describe Cloud Concepts (20-25%)
• Describe Core Azure Services (15-20%)
• Describe core solutions and management tools on Azure (10-15%)
• Describe general security and network security features (10-15%)
• Describe identity, governance, privacy, and compliance features (15-20%)
• Describe Azure cost management and Service Level Agreements (10-15%)

48 questions | 70% correct required to PASS

HackerRank Python Solution - Sets - No Idea!

There is an array of n integers. There are also 2 disjoint sets, A and B, each containing m integers. You like all the integers in set A and dislike all the integers in set B. Your initial happiness is 0. For each i integer in the array, if i ∊ A, you add 1 to your happiness. If i ∊ B, you add -1 to your happiness. Otherwise, your happiness does not change. Output your final happiness at the end.

Note: Since A and B are set, they have no repeated elements. However, the array might contain duplicate elements.

HackerRank Python Solution - Sets - Check Strict Superset

• You are given a set A and n other sets.
• Your job is to find whether set A is a strict superset of each of the N sets.
• Print True, if A is a strict superset of each of the N sets. Otherwise, print False.
• A strict superset has at least one element that does not exist in its subset.

HackerRank Python Solution - Sets - Check Subset

• You are given two sets, A  and B.
• Your job is to find whether set A is a subset of set B.
• If set A is a subset of set B, print True.
• If set A is not a subset of set B, print False.

HackerRank Python Solution - Sets - The Captain's Room

• Mr. Anant Asankhya is the manager at the INFINITE hotel. The hotel has an infinite amount of rooms.
• One fine day, a finite number of tourists come to stay at the hotel.
• The tourists consist of:
• A Captain.
• An unknown group of families consisting of members per group where ≠ .
• The Captain was given a separate room, and the rest were given one room per group.
• Mr. Anant has an unordered list of randomly arranged room entries. The list consists of the room numbers for all of the tourists. The room numbers will appear times per group except for the Captain's room.
• Mr. Anant needs you to help him find the Captain's room number. The total number of tourists or the total number of groups of families is not known to you.
• You only know the value of K and the room number list.

HackerRank Python Solution - Sets - Set Mutations

• We have seen the applications of union, intersection, difference, and symmetric difference operations, but these operations do not make any changes or mutations to the set.

• We can use the following operations to create mutations to a set: .update() or |=

• Update the set by adding elements from an iterable/another set.

>>> H = set("Hacker")
>>> R = set("Rank")
>>> H.update(R)
>>> print H
set(['a', 'c', 'e', 'H', 'k', 'n', 'r', 'R'])

• .intersection_update() or &= Update the set by keeping only the elements found in it and an iterable/another set.

HackerRank Python Solution - Sets - Symmetric Difference

• If the inputs are given on one line separated by a character (the delimiter), use split() to get the separate values in the form of a list. The delimiter is space (ASCII 32) by default. To specify that comma is the delimiter, use string. split(','). For this challenge, and in general, on HackerRank, space will be the delimiter.

Usage:

>> a = raw_input()
5 4 3 2
>> lis = a.split()
>> print (lis)
['5', '4', '3', '2']

• If the list values are all integer types, use the map() method to convert all the strings to integers.

HackerRank Python Solution - Sets - .symmetric_difference() operation

.symmetric_difference():

• The .symmetric_difference() operator returns a set with all the elements that are in the set and the iterable but not both.

• Sometimes, a ^ operator is used in place of the .symmetric_difference() tool, but it only operates on the set of elements in the set.

• The set is immutable to the .symmetric_difference() operation (or ^ operation).