How to write a function (Python 3.8) to find FASTA entry for DNA sequence

Prompt: FASTA files can contain an unlimited number of sequences, but are too large for most text editors to open and manipulate. One that can load a large FASTA file and extract a sequence of a given name. Write a script for this.
(Can’t format DNA sequence here)

Please help! I’ve asked comrades, watched videos, and did PythonScipt tutorials. I am lost and need assistance writing this code.