count_x

Given a string, compute recursively (no loops) the number of lowercase ‘x’ chars in the string.

count_x("xxhixx") -> 4
count_x("xhixhix") -> 3
count_x("hi") -> 0

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 count_x(string: str) -> int:
    pass


result = count_x('xxhixx')
print(result)

Tests

from main import count_x


def test_count_x_1():
    assert count_x('xxhixx') == 4


def test_count_x_2():
    assert count_x('xhixhix') == 3


def test_count_x_3():
    assert count_x('hi') == 0


def test_count_x_4():
    assert count_x('h') == 0


def test_count_x_5():
    assert count_x('x') == 1


def test_count_x_6():
    assert count_x('') == 0


def test_count_x_7():
    assert count_x('hihi') == 0


def test_count_x_8():
    assert count_x('hiAAhi12hi') == 0