See the glass half full - Idioms by The Free Dictionary
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see the glass as half full
To view a situation as generally better or more hopeful than might otherwise be perceived; to be optimistic. When it comes to the state of the world, I tend to see the glass as half full. People forget all the progress that has been made.
(see the) ˌglass half ˈfull/half ˈempty used to describe whether somebody has a positive or negative attitude towards something: People are prepared to see the glass half full at the moment rather than half empty. ♢ He’s a glass-half-full type of guy (= he always expects good things to happen).