Use Bitbucket api and python to download repo in zip

I use python3.5.0 ,bitbucket-api 0.5.0 on windows 10.

This is my code

#!python

>>>from bitbucket.bitbucket importBitbucket
>>>USERNAME = 'CCC'
>>>PASSWORD = 'BBB'
>>>bb = Bitbucket(USERNAME, PASSWORD, repo_name_or_slug="Py-Bitbucket-api")
>>>success, result = bb.repository.get()
>>>print (bb.repository.get())
True{......}
>>>success, archive_path = bb.repository.archive()
>>> print (success, archive_path)
True C:\....\Temp\tmp_zxpa_14

It download some tmp files. (tmp_zxpa_14.....) but it not a zip .

Do I miss some parameter?

I read the repository.py the function

archive(self, repo_slug=None, format='zip', prefix='':

format default 'zip' .Did I understand wrong?

BTW

Can Bitbucket-api specify the file to download?

How to modify my code?

I wandt to download one of file in my repo.