我已經(jīng)為此掙扎了幾個(gè)小時(shí)：import os, sys, reprint('Type the path to the folder.')input_path = input()input_path = os.path.join(input_path)print('Select the search term')input_term = input()search_regex = re.compile(input_term)all_files = os.listdir(input_path)for j in range(len(all_files)):    new_path = os.path.join(input_path, all_files[j])    search_regex = re.compile(input_term)    target_file = open(new_path, 'r')    file_content = target_file.read()    file_content_in_list = search_regex.findall(file_content)    print('A grand total of ' + str(len(file_content_in_list)) + ' items were found at ' + str(new_path))這按預(yù)期工作。該代碼讀取給定文件夾中的所有文件，并檢查找到搜索詞的次數(shù)。但是，當(dāng)我嘗試將代碼的不同部分定義為函數(shù)時(shí)，我只得到錯(cuò)誤：import os, sys, redef select_folder():    print('Type the path to the folder.')    input_path = input()    input_path = os.path.join(input_path)def select_all_files():    all_files = os.listdir(input_path)    for j in range(len(all_files)):        search_a_file()def ask_for_regex():    print('Select the search term')    input_term = input()    search_regex = re.compile(input_term)def search_a_file():    new_path = os.path.join(input_path, all_files[j])    search_regex = re.compile(input_term)    target_file = open(new_path, 'r')    file_content = target_file.read()    file_content_in_list = search_regex.findall(file_content)    print('A grand total of ' + str(len(file_content_in_list)) + ' items were found at ' + str(new_path))select_folder(): #Syntax Error here!    ask_for_regex():        select_all_files():# if i put them like this then everything break down. I guess the variables are forgotten?select_folder()ask_for_regex()select_all_files()我想這個(gè)錯(cuò)誤是顯而易見(jiàn)的，但我無(wú)法理解它......