How does beatuifulsoup get the value of an attribute?

the following code, I want to use beatuifulsoup to get the value of posid (1). How do I write it?

<div class="ec_ad_results" posid="1" prank="2" sourceid="160">
Sep.27,2021

first find the tag through the class, and then specify the attribute you are looking for in square brackets

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