de_front¶

Given a string, return a version without the first 2 chars. Except keep the first char if it is ‘a’ and keep the second char if it is ‘b’. The string may be any length. Harder than it looks.

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:

'Hello'

Output:

'llo'

Test 2¶

Input:

'java'

Output:

'va'

Test 3¶

Input:

'away'

Output:

'aay'

Test 4¶

Input:

'axy'

Output:

'ay'

Test 5¶

Input:

'abc'

Output:

'abc'

Test 6¶

Input:

'xby'

Output:

'by'

Test 7¶

Input:

'ab'

Output:

'ab'

Test 8¶

Input:

'ax'

Output:

'a'

Test 9¶

Input:

'axb'

Output:

'ab'

Test 10¶

Input:

'aaa'

Output:

'aa'

Test 11¶

Input:

'xbc'

Output:

'bc'

Test 12¶

Input:

'bbb'

Output:

'bb'

Test 13¶

Input:

'bazz'

Output:

'zz'

Test 14¶

Input:

'ba'

Output:

''

Test 15¶

Input:

'abxyz'

Output:

'abxyz'

Test 16¶

Input:

'hi'

Output:

''

Test 17¶

Input:

'his'

Output:

's'

Test 18¶

Input:

'xz'

Output:

''

Test 19¶

Input:

'zzz'

Output:

'z'