Python writes the MD5 value of a file for automation

Using Python to get the MD5 value of a file is a simple thing, Python provides the MD5 and hashlib two modules, you can get the MD5 value of the file.

The code is as follows:

#获取文件的MD5值, for small file    def getFileMD5 (self,filepath):        if Self.isfile (filepath):            f = open (filepath, ' RB ')            md5obj = hashlib.md5 ()            md5obj.update (F.read ())            hash = md5obj.hexdigest ()            f.close ()            return STR (hash). Upper ()        return None

The above code has been applied with the MD5 value of getting most files.

However, looking at the code, you will find that there is actually a process of reading the file when getting the MD5 value. This will have a problem, if the file is very large, larger than the memory of the machine, the above code will have a problem, the solution is to be read several times, the code is as follows:

#获取文件的MD5值, for larger files    def getBigFileMD5 (self,filepath):        if Self.isfile (filepath):            md5obj = HASHLIB.MD5 ()            maxbuf = 8192            f = open (filepath, ' RB ') while            True:                buf = F.read (maxbuf)                if not buf:                    break< C13/>md5obj.update (BUF)            f.close ()            hash = md5obj.hexdigest ()            return str (hash). Upper ()        return None

In addition, it is important to note that:The MD5 module has been canceled in Python version 3.2, so it is recommended to use the Hashlib module when getting MD5.

Python writes the MD5 value of a file for automation