Python MD5文件生成码

import md5
import sys
def sumfile(fobj):
m = md5.new()
while true:
d = fobj.read(8096)
if not d:
break
m.update(d)
return m.hexdigest()
def md5sum(fname):
if fname == '-':
ret = sumfile(sys.stdin)
else:
try:
f = file(fname, 'rb')
except:
return 'failed to open file'
ret = sumfile(f)
f.close()
return ret
if __name__ == '__main__':
for fname in sys.argv[1:]:
print '%32s %s' % (md5sum(fname), fname)