Use the list of sequence & write a program that finds the sequence with the highest GC content

Need to calculate the GC content of each item in list and use program to print percent content and sequence with highest

I have tried using a for statement and trying to combine the counts and divide by the Toal in each sequence

Use the list of sequence ["ATATCCG", "TCCG", "ATGTACTG", "ATGGCTG", "ATCA"] as an example, write a program that finds the sequence with the highest GC content (the percentage of G and C nucleotides) among a list of sequences. The program prints the sequence and its GC content.