Comparing files in a zip to files on drive

[Justin Ezequiel]

kj7ny wrote:
> compare a file on a hard drive to a file in a python created zip file
> to tell if the file has changed?

>>> fileondisk = r'C:\Documents and Settings\power\Desktop\ES3dc+Template.3f'
>>> zipondisk = r'C:\Documents and Settings\power\Desktop\temps.zip'
>>> import zipfile
>>> z = zipfile.ZipFile(zipondisk)
>>> z.namelist()
['ES1+Template.3f', 'ES3sc+Template.3f', 'ES3dc+Template.3f']
>>> info = z.getinfo('ES3dc+Template.3f')
>>> info.CRC
1620938006
>>> import binascii
>>> checksum = 0
>>> fp = open(fileondisk, 'rb')
>>> while 1:
... 	data = fp.read(32*1024)
... 	if not data: break
... 	checksum = binascii.crc32(data, checksum)
... 	
>>> checksum
1620938006
>>>