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.

de_front("Hello") -> "llo"
de_front("java") -> "va"
de_front("away") -> "aay"

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.

Starter Code

def de_front(string: str) -> str:
    pass


result = de_front('Hello')
print(result)

Tests

from main import de_front


def test_de_front_1():
    assert de_front('Hello') == 'llo'


def test_de_front_2():
    assert de_front('java') == 'va'


def test_de_front_3():
    assert de_front('away') == 'aay'


def test_de_front_4():
    assert de_front('axy') == 'ay'


def test_de_front_5():
    assert de_front('abc') == 'abc'


def test_de_front_6():
    assert de_front('xby') == 'by'


def test_de_front_7():
    assert de_front('ab') == 'ab'


def test_de_front_8():
    assert de_front('ax') == 'a'


def test_de_front_9():
    assert de_front('axb') == 'ab'


def test_de_front_10():
    assert de_front('aaa') == 'aa'


def test_de_front_11():
    assert de_front('xbc') == 'bc'


def test_de_front_12():
    assert de_front('bbb') == 'bb'


def test_de_front_13():
    assert de_front('bazz') == 'zz'


def test_de_front_14():
    assert de_front('ba') == ''


def test_de_front_15():
    assert de_front('abxyz') == 'abxyz'


def test_de_front_16():
    assert de_front('hi') == ''


def test_de_front_17():
    assert de_front('his') == 's'


def test_de_front_18():
    assert de_front('xz') == ''


def test_de_front_19():
    assert de_front('zzz') == 'z'