Using ansible api,tmp files still being

my env is Ubuntu 13.1,ansible 2.1

I am using the official example to learn ansible api,

$ cat official.py
https://github.com/haroldTlan/ansible/blob/master/official.py

but tmp file still there

$ cd /.ansible/tmp
$ ls

ansible-local-65005zhPKlI ansible-local-70192KRXI4M

what should I do?