HackerRank Python Solution - Strings - Split and Join

In Python, a string can be split on a delimiter.

Example:

>>> a = "this is a string"
>>> a = a.split(" ") # a is converted to a list of strings. 
>>> print a
['this', 'is', 'a', 'string']

Joining a string is simple:

 

>>> a = "-".join(a)
>>> print a
this-is-a-string 

HackerRank Python Solution - Strings - sWAP cASE

You are given a string and your task is to swap cases. In other words, convert all lowercase letters to uppercase letters and vice versa.

For Example:

Www.HackerRank.com → wWW.hACKERrANK.COM
Pythonist 2 → pYTHONIST 2  

HackerRank Python Solution - Strings - Designer Door Mat

Mr. Vincent works in a doormat manufacturing company. One day, he designed a new doormat with the following specifications:

• Mat size must be N x M. (N is an odd natural number, and M is 3 times N.)
• The design should have 'WELCOME' written in the center.
• The design pattern should only use |,. and - characters.

HackerRank Python Solution - Built-Ins - ginortS

• You are given a string S. S contains alphanumeric characters only.

• Your task is to sort the string S in the following manner:
• All sorted lowercase letters are ahead of uppercase letters.
• All sorted uppercase letters are ahead of digits.
• All sorted odd digits are ahead of sorted even digits.

HackerRank Python Solution - Built-Ins - Any or All

any():

• This expression returns True if any element of the iterable is true. If the iterable is empty, it will return False.

Code:

>>> any([1>0,1==0,1<0])
True
>>> any([1<0,2<1,3<2])
False

HackerRank Python Solution - Built-Ins - Athlete Sort

• You are given a spreadsheet that contains a list of N athletes and their details (such as age, height, weight, and so on). You are required to sort the data based on the K^th attribute and print the final resulting table. Follow the example given below for a better understanding.

• Note that K is indexed from 0 to M-1, where M is the number of attributes.
• Note: If two attributes are the same for different rows, for example, if two athletes are of the same age, print the row that appeared first in the input.

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.