I think

print("Remember to wear sunscreen!") if hot_outside unless Weather.is_raining()

Is more readable than

if hot_outside and not Weather.is_raining(): print("Remember to wear 
sunscreen!")

I think the unless syntax would be especially useful when there is a series of 
functions like this.

The general use case would be:

side_effecting_expression if frequent_condition unless rare_condition
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