Tumblr tags not posting

[SamelCamel]

I am trying to post a post with more than one tag. I can get one to work, but not two.

post = client.post('post', blog_url=blog_url, params={
    'type':'text',
    'state':'published',
    'tags':['test', 'moretests'],
    'body':'test'
    }
                   )

I got one to work by not adding square brackets. I would think I'd use them to use more than one because the Tumblr API uses them, but that doesn't work