python - 是使用 main() 函数来摆脱全局变量的最佳实践吗？

Question

我最近才开始学习python。我遇到了我不想要的全局变量的问题。下面是我的代码的一小部分，它显示了两个变量短语和图片，它们是在我的函数中使用的全局变量。

    # Lets the user input a phrase for the players to guess
    def choose_phrase():
        phrase = input("Type a phrase: ")

        valid_response = False
        while not valid_response:
            for character in phrase:
                valid_response = True
                if not character.isalpha() and character != ' ':
                    valid_response = False
                    phrase = input("Type a phrase with only letters and spaces: ")
                    break

        return phrase


    # This declares the ascii art in list: 'picture'. It will also add the blank letter spaces showing 
    # the players how many letters and words the phrase is. It also has a mechanism for wrapping the 
    # output for easier viewing.When wrapping, this code will produce more items in 'picture' to support 
    # more lines.
    def create_initial_picture():
        picture = [...]
        count = 1
        line = 19
        for character in phrase:
            if (character == ' ') & (count > 25):
                additional_lines = ["", "", ""]
                picture.extend(additional_lines)
                line += 3
                count = 1
            elif character == ' ':
                picture[line] = picture[line] + "    "
            else:
                picture[line] = picture[line] + "___ "
            count += 1
        return picture


    phrase = choose_phrase()
    picture = create_initial_picture()

我不喜欢全局变量，所以我尝试从其他语言模拟主函数来解决这个问题，然后我的代码看起来像这样：

    def main():
        phrase = choose_phrase()
        picture = create_initial_picture(phrase)

    # Lets the user input a phrase for the players to guess
    def choose_phrase():
        phrase = input("Type a phrase: ")

        valid_response = False
        while not valid_response:
            for character in phrase:
                valid_response = True
                if not character.isalpha() and character != ' ':
                    valid_response = False
                    phrase = input("Type a phrase with only letters and spaces: ")
                    break

        return phrase


    # This declares the ascii art in list: 'picture'. It will also add the blank letter spaces showing 
    # the players how many letters and words the phrase is. It also has a mechanism for wrapping the  
    # output for easier viewing. When wrapping, this code will produce more items in 'picture' to support 
    # more lines.
    def create_initial_picture(phrase):
        picture = [...]
        count = 1
        line = 19
        for character in phrase:
            if (character == ' ') & (count > 25):
                additional_lines = ["", "", ""]
                picture.extend(additional_lines)
                line += 3
                count = 1
            elif character == ' ':
                picture[line] = picture[line] + "    "
            else:
                picture[line] = picture[line] + "___ "
            count += 1
        return picture


    main()

这完成了摆脱全局变量，但我不确定这是否是正统的或被认为是最佳实践。我很想尽早养成好习惯，如果它会导致我陷入更大的问题，我不想继续这种方法。对此的任何反馈都会非常有帮助。谢谢

标签： pythonglobal-variablesmainlocal-variables