How to understand the Python code of this checksum algorithm?

Source: Internet
Author: User
Php Chinese network (www.php.cn) provides the most comprehensive basic tutorial on programming technology, introducing HTML, CSS, Javascript, Python, Java, Ruby, C, PHP, basic knowledge of MySQL and other programming languages. At the same time, this site also provides a large number of online instances, through which you can better learn programming... Reply: I can explain this code to you. it's a classic Code. I just saw it. it looks like this:

Def checksum (data): if len (data) % 2: data + = B '\ x00's = sum (array. array ('H', data) s = (s & 0 xffff) + (s> 16) s + = (s> 16) return _ socket. ntohs (~ S & 0 xffff)
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