[Python] print success messages for asserts in python

I am using assert in python. Every time an assert fails I get the failure message which I would have put there to be printed. I was wondering if there is a way to print a custom success message when the assert condition passes?

I am using py.test framework.

for instance:

assert self.clnt.stop_io()==1, "IO stop failed"


for the above assert I get message "IO stop failed" if assert fails but I am looking to have "IO stop succeeded" if assert passes. something like this:

assert self.clnt.stop_io()==1, "IO stop failed", "IO stop succeeded"

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