Among the ruins of an ancient city a group of archaeologists found a mysterious function with lots of HOLES in it called ```getNum(n)``` (or `get_num(n)` in ruby, python, or r). They tried to call it with some arguments. And finally they got this journal:
The archaeologists were totally stuck with this challenge. They were all in desperation but then.... came YOU the SUPER-AWESOME programmer. Will you be able to understand the mystery of this function and rewrite it?

Difficulty: introductory

Starter code:

def get_num(n):
	

Solutions:
def get_num(n):
    return sum({'0': 1, '6': 1, '9': 1, '8': 2}.get(d, 0) for d in str(n))

get_num = lambda n: sum(int('1000001021'[int(d)]) for d in str(n))

def get_num(n):
    return sum(str(n).count(i) for i in "06889")

get_num=lambda n:sum([0,[1,2][i=='8']][i in'0689'] for i in str(n))

holes = {'0': 1, '6': 1, '8': 2, '9': 1}

def get_num(n):
    return sum(holes.get(c, 0) for c in str(n))

holes = {"0": 1, "6":1, "8":2, "9":1}

def get_num(n):
    return sum(holes.get(i, 0) for i in str(n))

def get_num(n):
  holes = {'0':1, '6':1, '8':2, '9':1}
  return sum(holes[d] if d in holes else 0 for d in str(n))

get_num=lambda n:sum((d in'0689')+(d=='8')for d in str(n))

def get_num(n):
    n = str(n).replace('8', '00').replace('9', '0').replace('6', '0')
    return n.count('0')

def get_num(n):
    holes=0
    for val in str(n):
      if val in '069':
        holes+=1
      if val=='8':
        holes+=2
    return holes