def remove_from_string(string, letters):
    """Given a string and a list of individual letters, returns a new string
    which is the same as the old one except all occurrences of those letters
    have been removed from it."""
    for i in string:
        for j in letters:
            if i == j:
                string = string.replace(str(i), "")  # Don't forget to update string!
    return string