Python递归收益：递归列出目录中的所有文件
示例
首先，导入可处理文件的库：
from os import listdir fromos.pathimport isfile, join, exists
一个帮助程序功能，用于仅读取目录中的文件：
def get_files(path):
for file in listdir(path):
full_path = join(path, file)
if isfile(full_path):
if exists(full_path):
yield full_path另一个帮助程序功能仅获取子目录：
def get_directories(path):
for directory in listdir(path):
full_path = join(path, directory)
if not isfile(full_path):
if exists(full_path):
yield full_path现在使用这些函数递归获取目录及其所有子目录中的所有文件（使用生成器）：
def get_files_recursive(directory):
for file in get_files(directory):
yield file
for subdirectory in get_directories(directory):
for file in get_files_recursive(subdirectory): #在这里递归调用
yield file可以使用yieldfrom以下命令简化此功能：
def get_files_recursive(directory):
yield from get_files(directory)
for subdirectory in get_directories(directory):
yield from get_files_recursive(subdirectory)
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