[Python] Loop through dictionary and select values [duplicate]

I have a dictionary with many instances of this basic structure:

dict = {'source' : 'something',
'topic' : 'something else',
'table' : 'another thing',
'data' : dftmp
}


I want to iterate through the instances, check if the topic value matches a string, and return the data value.

How would one do this?

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