python删除文件
import os删除文件：
os.remove()
删除空目录：
os.rmdir()
递归删除空目录：
os.removedirs()
递归删除目录和文件（类似DOS命令DeleteTree）：
方法1：自力更生，艰苦创业
# Delete everything reachable from the directory named in 'top',
# assuming there are no symbolic links.
# CAUTION:This is dangerous!For example, if top == '/', it
# could delete all your disk files.
import os
for root, dirs, files in os.walk(top, topdown=False):
for name in files:
os.remove(os.path.join(root, name))
for name in dirs:
os.rmdir(os.path.join(root, name))
方法2：前人栽树，后人乘凉
import shutil
shutil.rmtree()
一行搞定 __import__('shutil').rmtree()
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