A simple python function to split a string into a list of strings based on a character limit. It preserves the words entire. For instance if you have a limit of four characters "A dog" would be generated as ["A", "dog"] so as not to split up the word into ["A do", "g"]

word_split.py

def add_string_breaks(string):
    list_words_in_str = string.split()
    str_standard_whitespace = " ".join(list_words_in_str)
    count_words_in_str = len(list_words_in_str)

    slogan_lines = []
    i = 0
    possible_words_in_line = count_words_in_str
    while i < possible_words_in_line:
        text_already_newline = " ".join(slogan_lines)
        print("Text already newline", text_already_newline)
        text_to_newline = str_standard_whitespace.replace(text_already_newline, "")
        list_words_to_newline = text_to_newline.split()
        previous_word = i
        current_word = i + 1
        current_str = " ".join(list_words_to_newline[:current_word])
        print(current_str)
        word_char_count = len(" ".join(list_words_to_newline[:i+1]))
        print(word_char_count)
        if word_char_count < 15 and current_word < len(list_words_to_newline) + 1:
            i += 1
            continue
        else:
            line_str = " ".join(list_words_to_newline[:previous_word])
            if len(line_str) > 15:
                raise ValueError("First word of line too long")
            else:
                slogan_lines.append(line_str)
                possible_words_in_line = count_words_in_str - current_word
                words_in_slogan_lines = len(" ".join(slogan_lines).split())
                if words_in_slogan_lines < count_words_in_str:
                    i = 0
                else:
                    i = count_words_in_str

    return slogan_lines