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Streaming with Python API

Hi guys,
I’m struggling to understand some of the code for to stram data from a python script to the plotly site.

I followed the article:

Specifically what I cannot understand is the following line of code:

url = py.plot([
‘x’: [], ‘y’: [], ‘type’: ‘scatter’,
‘stream’: {
‘token’: plotly_user_config[‘plotly_streaming_tokens’][0],
‘maxpoints’: 200
}], filename=‘Raspberry Pi Streaming Example Values’)

Can someone break this down and explain excatly what is going on with the above line of code?

Much appreciated,