repeat_front

Requirements:

• substrings and slicing

• loop with a counter variable

• string building and filtering

Given a string and an int n, return a string made of the first n characters of the string, followed by the first n-1 characters of the string, and so on. You may assume that n is between 0 and the length of the string, inclusive (i.e. n >= 0 and n <= str.length()).

This exercise was taken from codingbat.com and has been adapted for the Python language. There are many great programming exercises there, but the majority are created for Java.

Test 1

Input:

'Chocolate'
4

Output:

'ChocChoChC'

Test 2

Input:

'Chocolate'
3

Output:

'ChoChC'

Test 3

Input:

'Ice Cream'
2

Output:

'IcI'

Test 4

Input:

'Ice Cream'
1

Output:

'I'

Test 5

Input:

'Ice Cream'
0

Output:

''

Test 6

Input:

'xyz'
3

Output:

'xyzxyx'

Test 7

Input:

''
0

Output:

''

Test 8

Input:

'Java'
4

Output:

'JavaJavJaJ'

Test 9

Input:

'Java'
1

Output:

'J'