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对文件进行解压缩是我们日常工作中最平常不过的行为了，压缩过的文件不仅可以节省磁盘空间，而且在网络传输中也可以节省不少时间。

Python为我们提供了zipfile模块，这使得我们可以十分方便地对文件进行解压缩操作，而且代码书写也十分简单：

对文件进行压缩：

from zipfile import ZipFile
import osdef get_all_file_paths(directory):file_paths = []# 把所有的文件夹以及子文件夹、以及文件全部搞出来for root, directories, files in os.walk(directory):for filename in files:# 得到完全路径filepath = os.path.join(root, filename)file_paths.append(filepath)return file_pathsdef main():directory = './Junit'file_paths = get_all_file_paths(directory)print('Following files will be zipped:')for file_name in file_paths:print(file_name)with ZipFile('my_python_files.zip', 'w') as zip:for file in file_paths:zip.write(file)print('All files zipped successfully!')if __name__ == "__main__":main()

输出：

Following files will be zipped:
./Junit\hamcrest-core-1.3.jar
./Junit\junit-4.11-javadoc.jar
./Junit\junit-4.11-sources.jar
./Junit\junit-4.11.jar
./Junit\junit-4.7.jar
All files zipped successfully!

不过这个算法的压缩率貌似不是很高，至少在这个文件上跟360比还是差100KB。

对压缩文件进行解压：

from zipfile import ZipFilefile_name = "Junit 4.11.zip"with ZipFile(file_name, 'r') as zip:# printing all the contents of the zip filezip.printdir()print('Extracting all the files now...')zip.extractall()print('Done!')

输出：

File Name                                             Modified             Size
Junit/                                         2013-04-22 20:51:10            0
Junit/hamcrest-core-1.3.jar                    2013-04-22 19:04:48        45024
Junit/junit-4.11-javadoc.jar                   2013-04-22 19:04:00       379344
Junit/junit-4.11-sources.jar                   2013-04-22 19:03:42       151329
Junit/junit-4.11.jar                           2013-04-22 19:03:32       245039
Junit/junit-4.7.jar                            2013-04-22 19:04:00       232354
Extracting all the files now...
Done!