Question

python如何判断一个文件是否为gzip文件

Answer 1

本文实例讲述了Python实现压缩与解压gzip大文件的方法。分享给大家供大家参考，具体如下：
#encoding=utf-8
#author: walker
#date: 2015-10-26
#summary: 测试gzip压缩/解压文件
import gzip
BufSize = 1024*8
def gZipFile(src, dst):
fin = open(src, 'rb')
fout = gzip.open(dst, 'wb')
in2out(fin, fout)
def gunZipFile(gzFile, dst):
fin = gzip.open(gzFile, 'rb')
fout = open(dst, 'wb')
in2out(fin, fout)
def in2out(fin, fout):
while True:
buf = fin.read(BufSize)
if len(buf) < 1:
break
fout.write(buf)
fin.close()
fout.close()
if __name__ == '__main__':
src = r'D:\tmp\src.txt'
dst = r'D:\tmp\src.txt.gz'
ori = r'D:\tmp\ori.txt'
gZipFile(src, dst)
print('gZipFile over!')
gunZipFile(dst, ori)
print('gunZipFile over!')

也可以简单地封装成一个类：
class GZipTool:
def __init__(self, bufSize):
self.bufSize = bufSize
self.fin = None
self.fout = None
def compress(self, src, dst):
self.fin = open(src, 'rb')
self.fout = gzip.open(dst, 'wb')
self.__in2out()
def decompress(self, gzFile, dst):
self.fin = gzip.open(gzFile, 'rb')
self.fout = open(dst, 'wb')
self.__in2out()
def __in2out(self,):
while True:
buf = self.fin.read(self.bufSize)
if len(buf) < 1:
break
self.fout.write(buf)
self.fin.close()
self.fout.close()

Answer 2

读取文件名，判断最后三位是否为“.gz”即可