How to use the button attribute "args"

Question

https://www.odoo.com/documentation/9.0/reference/views.html
In the above documentation we can see there is an attribute named "args" associated with button elements. But the document lacks more details about using this attribute. Instead it just says "see type". I tried to find the usage of this attribute by checking Odoo's core modules, but ends with no result.
Is it something we can use to pass the data from view file to python code?
What is the syntax? (key/value dict)
How to get access the p

Bejaoui Souheil · Accepted Answer

*Hi,*
***Context*** *Context* is a dictionary carrying session data. *Context* can be used in the server or the client side. In your view you can add new values like this:
<button name="apply" context="{'key': value}" /> and get this value in the server side like this:
value = self.env.context.get('key')
***attrs*** *attrs* is a dictionary carrying some field option like invisible, required and readonly. *attrs* allow you to define condition for each option like this:
<field name="name" attrs="{

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