用Python自动解压各种压缩文件

编写一个Python程序,每次下载压缩包形式的文件后,自动将内部文件解压到当前文件夹后将压缩包删除。
提到压缩文件就要分不同压缩格式进行讨论,主要有以下4种:
.gz:即gzip,通常只能压缩一个文件。
.tar:本质上不是压缩工具而是打包工具,可以跟.gz配合形成.tar.gz的打包压缩格式。
.zip:和.tar.gz很类似但可以打包压缩多个文件。
.rar:打包压缩文件,最初用于DOS。

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import glob
import os
import gzip
import tarfile
import zipfile
import rarfile
import time

class unzip_files:
def ungz(self, filename):
filename = filename[:-3]
gz_file = gzip.GzipFile(filename)
with open(filename, "w+") as file:
file.write(gz_file.read())
return filename

def untar(self, filename):
tar = tarfile.open(filename)
names = tar.getnames()
if not os.path.isdir(filename + "_dir"):
os.mkdir(filename + "_dir")
for name in names:
tar.extract(name, filename + "_dir/")
tar.close()

def unzip(self, filename):
zip_file = zipfile.ZipFile(filename)
if not os.path.isdir(filename + "_dir"):
os.mkdir(filename + "_dir")
for names in zip_file.namelist():
zip_file.extract(names, filename + "_dir/")
zip_file.close()

def unrar(self, filename):
rar = rarfile.RarFile(filename)
if not os.path.isdir(filename + "_dir"):
os.mkdir(filename + "_dir")
os.chdir(filename + "_dir")
rar.extractall()
rar.close()

def main(self):
for filename in filename_lst:
if '.' in filename:
suffix = filename.split('.')[-1]
if suffix == 'gz':
new_filename = self.ungz(path+'/'+filename)
os.remove(path+'/'+filename)
if new_filename.split('.')[-1] == 'tar':
self.untar(path+'/'+new_filename)
os.remove(path+'/'+new_filename)
if suffix == 'tar':
self.untar(path+'/'+filename)
os.remove(path+'/'+filename)
if suffix == 'zip':
print(filename)
self.unzip(path+'/'+filename)
os.remove(path+'/'+filename)
if suffix == 'rar':
self.unrar(path+'/'+filename)
os.remove(path+'/'+filename)

path = r'D:\\download'

while True:
file_lst = glob.glob(path + '/*')
filename_lst = [os.path.basename(i) for i in file_lst]

uzf = unzip_files()
uzf.main()
time.sleep(5)
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