help!!

gistfile1.py

# Q3.

"1 2 3 4 5 6 [7] 6 5 4 3 2 1 [0] 1 2 [3] 2 1 0 [-1] 0 1 2 3 4 [5] [4] 5 6"


def pingpong(n):
    """Return the nth element of the ping-pong sequence.

    >>> pingpong(7)
    7
    >>> pingpong(8)
    6
    >>> pingpong(15)
    1
    >>> pingpong(21)
    -1
    >>> pingpong(22)
    0
    >>> pingpong(30)
    6
    >>> pingpong(68)
    2
    >>> pingpong(69)
    1
    >>> pingpong(70)
    0
    >>> pingpong(71)
    1
    >>> pingpong(72)
    0
    >>> pingpong(100)
    2
    """
    "*** YOUR CODE HERE ***"


    def pingpongdir(n, direction):
        if n == 1:
            return 1
        elif direction:
            if has_seven(n) or n % 7 == 0:
                return pingpongdir(n-1, False) + 1 
            else:
                return pingpongdir(n-1, True) + 1
        else:
            if has_seven(n) or n % 7 == 0:
                return pingpongdir(n-1, True) - 1
            else:
                return pingpongdir(n-1, False) - 1 
    return pingpongdir(n, False)
    

def has_seven(k):
"""Has a has_seven
>>> has_seven(3)
False
>>> has_seven(7)
True
>>> has_seven(2734)
True
>>> has_seven(2634)
False
>>> has_seven(734)
True
>>> has_seven(7777)
True
"""
"*** YOUR CODE HERE ***"
if k % 10 == 7:
return True
elif k // 10 == 0:
return False
else:
return has_seven(k // 10)

great code baby