what is the constraints of black panther in the opening scenes and show textual evidence?

To provide an accurate analysis I would need to know which version of "Black Panther" you are referring to. If we are considering the 2018 film directed by Ryan Coogler, the opening scenes set up several constraints for the character of T'Challa, who is the Black Panther.

1. Duty to His Nation: T'Challa is tasked with succeeding his father as the king of Wakanda. This is evident when the character Zuri (played by Forest Whitaker) says, "The time has come for you to come home and be reunited with your people, with your brothers and sisters." This line signals T’Challa’s duty to return to Wakanda and take up the mantle of king, which is a significant constraint as it requires him to prioritize his nation's well-being over personal desires.

2. The Burden of Legacy: Throughout the opening sequences, T'Challa grapples with the legacy left behind by his father, T'Chaka. His father’s death is not only an emotional burden but also a political one as it has thrust T'Challa into power. This is shown when T'Challa speaks to Nakia (played by Lupita Nyong'o), saying, "I am not ready to be without you." Here T'Challa expresses his doubt and the weight of expectations placed upon him as the new king.

3. Secrecy of Wakanda: The opening narration of the film describes how Wakanda hides its true nature from the world by posing as a third world country, while it is actually a technologically advanced civilization powered by the metal vibranium. T'Challa, as the Black Panther and king, is constrained to maintain this secret to protect his people from outside forces that would exploit Wakanda’s resources.

Each of these constraints—duty, legacy, and secrecy—shape T'Challa's decisions and actions throughout the film. They are confirmed by the film’s dialogue, character interactions, and the narrative set-up in the initial scenes.

Remember, it's important to review the actual film or script to gather precise textual evidence, as the above are paraphrased examples based on a general recollection of the film's content.