An optimist is a person with a positive outlook on life. One who characteristically looks at events or conditions with optimism. Optimism is a mental attitude or world view that interprets situations and events as being best (optimized), meaning that in some way for factors that may not be fully comprehended, the present moment is in an optimum state. The concept is typically extended to include the attitude of hope for future conditions unfolding as optimal as well.
A person who takes advantage of opportunities as and when they arise, regardless of planning or principle.A person who maximizes his/her benefit in every action he/she takes.
The opportunist sees an opportunity in every difficulty, and Luck happens when preparation meets opportunity and optimism