Python study note 4 (guid & UUID)

Confusion between guid and UUID
C # is too deep, so when looking for a way to generate a unique value, it is natural to search for "Python guid ". Poor results. I thought Python didn't generate a method similar to the guid in C. Calm down and look for it carefully. It turned out to be a keyword error. In python, this is called UUID.
Search for this article on Google.ArticleIt seems that the introduction is comprehensive.
Http://www.ietf.org/rfc/rfc4122.txt
Http://mozier.cnblogs.com/archive/2005/01/19/94331.html

There are four UUID types in the python Standard Library:
Uuid1 ([node [, clock_seq]) time-based UUID
Uuid3 (namespace, name) MD5-encrypted UUID
Uuid4 () produces a random UUID
Uuid5 (namespace, name) is based on SHA-1-encrypted UUID

It is strange that there is no uid2. And I don't know if the application fields are different. For me, uuid1 () is currently the most common.