Code

def CheckHash(text, n):
    '''
    This function returns True if every n-th character in the
    string text is the character #; False otherwise.
    If n is less than 1 then return False, as well if text is an empty string OR
    it has less than n characters then also return False.

    For example, if text = "ab#cd#ef#" and n = 3 then the function
    will return True.
    If text="ab#cd#ef" and n = 3 then the function returns True.
    If text="ab#cd$ef#" and n = 3 then the function returns False.
    More test cases listed below in main function along with
    their expected output (inside comments)
    '''
    match = True

    if(n == 0 or n > len(text) or len(text)==0):
        match = False
    else:
        for i in range(0,len(text)):
            if((i+1)%n == 0 and not text[i] == '#'):
                match = False
                break
    return match

def main():
    print(CheckHash("ab#cd#ef#", 3)) ## True
    print(CheckHash("ab#cd#ef", 3)) ## True
    print(CheckHash("ab#cd$ef#", 3)) ## False
    print(CheckHash("a#b#c#d", 2)) ## True
    print(CheckHash("a#b#c#d", 1)) ## False
    print(CheckHash("a#b#c#d", 0)) ## False
    print(CheckHash("", 10)) ## False
    print(CheckHash("a#b#c#d", 3)) ## False
    print(CheckHash("a#b#c#d", 10)) ## False
    print(CheckHash("##$###$#", 2)) ## True

main()