HackerRank Python Solution - Strings - Alphabet Rangoli

• You are given an integer, N. Your task is to print an alphabet rangoli of size N. (Rangoli is a form of Indian folk art based on the creation of patterns.)
• Different sizes of alphabet rangoli are shown below:

#size 3

----c----
--c-b-c--
c-b-a-b-c
--c-b-c--
----c----

HackerRank Python Solution - Strings - String Formatting

Given an integer, n, print the following values for each integer i from 1 to n:

• Decimal
• Octal
• Hexadecimal (capitalized)
• Binary

Function Description:

• Complete the print_formatted function in the editor below.
• print_formatted has the following parameters:
• int number: the maximum value to print

HackerRank Python Solution - Strings - Capitalize!

• You are asked to ensure that the first and last names of people begin with a capital letter in their passports. For example, alison heck should be capitalized correctly as Alison Heck.

• Given a full name, your task is to capitalize the name appropriately.

HackerRank Python Solution - Strings - Text Wrap

• You are given a string S and width w.
• Your task is to wrap the string into a paragraph of width w.

Function Description:

• Complete the wrap function in the editor below.
• the wrap has the following parameters:
• string: a long string
• int max_width: the width to wrap to
• Returns string: a single string with newline characters ('\n') where the breaks should be

HackerRank Python Solution - Strings - Text Alignment

• In Python, a string of text can be aligned left, right and center.

.ljust(width):

• This method returns a left-aligned string of length width.

>>> width = 20
>>> print 'HackerRank'.ljust(width,'-')
HackerRank----------

HackerRank Python Solution - Strings - String Validators

• Python has built-in string validation methods for basic data. It can check if a string is composed of alphabetical characters, alphanumeric characters, digits, etc.

str.isalnum():

• This method checks if all the characters of a string are alphanumeric (a-z, A-Z and 0-9).

>>> print 'ab123'.isalnum()
True
>>> print 'ab123#'.isalnum()
False

HackerRank Python Solution - Strings - Find a String

• In this challenge, the user enters a string and a substring. You have to print the number of times that the substring occurs in the given string. String traversal will take place from left to right, not from right to left.
• NOTE: String letters are case-sensitive.

Input Format:

• The first line of input contains the original string. The next line contains the substring.

HackerRank Python Solution - Strings - Mutations

• We have seen that lists are mutable (they can be changed), and tuples are immutable (they cannot be changed).
• Let's try to understand this with an example.
• You are given an immutable string, and you want to make changes to it.

Example:

>>> string = "abracadabra"

HackerRank Python Solution - Strings - What's Your Name?

You are given the firstname and lastname of a person on two different lines. Your task is to read them and print the following:

 

Hello firstname lastname! You just delved into python.

Function Description:

• Complete the print_full_name function in the editor below.
• print_full_name has the following parameters:
• string first: the first name
• string last: the last name
• Prints string: 'Hello firstname lastname! You just delved into python' where and are replaced with first and last.

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