请问怎么用Python函数写出来

输入一个文件路径，打开该文件（如：The Rivals in the Life.txt），并循环等待用户输入；
1.输入1，词频统计，输出出现次数最多的10个单词和其次数，并讲所有单词及此处保存到log.txt
2 输入2，复制文件到另一个目录下
3输入3，输出文件行数
3输入4，分别输出文件中字符最多的行和字符最少的行的字符个数
4输入5，在文件后追加字符串 “hello world”，并输出最后一行字符
5输入6，关闭该文件，打印“操作结束“
6输入其他字符，打印“无效字符！！请继续输入“
用python写，用几个函数实现。.

虽然不知道为什么你要几个函数实现，但我觉得我这函数创的够多了...

import os
import shutil


def count(string):
    for special in [',', '.', ';', '!', '?', '\n']:
        string = string.replace(special, ' ')
    words = string.lower().split()
    sort = {word: words.count(word) for word in set(words)}
    sort = {word: sort[word] for word in sorted(sort.keys(), key=lambda _: sort[_], reverse=True)}
    print('\n'.join([f'{word}\t\t{sort[word]}' for word in sort][:10]))
    open('log.txt', 'w', encoding='utf-8').write('\n'.join([f'{word}\t\t{sort[word]}' for word in sort]))


def copy(origin, target):
    shutil.copy(origin, target)


def rows(string):
    print(len(string.split('\n')))


def character(string):
    characters = [len(row) for row in string.split('\n')]
    print(f'最多的行：{characters.index(max(characters)) + 1}，字符个数：{max(characters)}')
    print(f'最少的行：{characters.index(min(characters)) + 1}，字符个数：{min(characters)}')


def append(origin, string):
    open(origin, 'a', encoding='utf-8').write(string)
    print(open(origin, 'r', encoding='utf-8').read().split('\n')[-1])


if __name__ == '__main__':
    path = input('请输入文件路径：')
    if os.path.exists(path) and os.path.isfile(path):
        file = open(path, 'r', encoding='utf-8')
        while 1:
            file.seek(0)
            num = input('请输入操作：')
            if num == '1':
                count(file.read().strip())
            elif num == '2':
                copy(path, f'test/{path}')
            elif num == '3':
                rows(file.read())
            elif num == '4':
                character(file.read())
            elif num == '5':
                append(path, 'hello world')
            elif num == '6':
                file.close()
                print('操作结束')
                break
            else:
                print('无效字符！！请继续输入')
    else:
        print('请输入正确的文件路径！')