Your task is to write a GFF$3$ feature exporter. A user should be able to run your script like this:

$ export$\_$gff$3\_$feature.py $--$source$\_$gff$=/$path$/$to$/$some$.$gff$3--$type$=$gene $--$attribute$=$ID $--$value$=$YAR$003$W

There are $4$ arguments here that correspond to values in the GFF$3$ columns. In this case, your script should read the path to a GFF$3$ file, find any gene $($column $3)$ which has an ID$=$YAR$003$W $($column $9).$ When it finds this, it should use the coordinates for that feature $($columns $4,5$ and $7)$ and the FASTA sequence at the end of the document to return its FASTA sequence.