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.