rookie here. Can anyone tell me what is wrong with this? I cant seem to print my “primer” string, I am sure that the “region” variable is not empty for I tested it out already.
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Answer
In the future, please post the text of your program, not an image of the program.
I modified your program to do what I think your intent was.
The main thing you needed to do was call complement(region) and assign the return value to a variable.
dna = "ATCGATCGATCGTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAGCTAG" print(f"#1 'dna' len={len(dna)} {dna}") start = "3" end = "30" dna = dna[int(start):int(end)] print(f"#2 'dna' len={len(dna)} {dna}") region = dna[0:20] print(f"#2 'region' len={len(region)} {region}") def complement(region): comp = {'A': 'T', 'T': 'A', 'C': 'G', 'G': 'C'} primer = '' for i in region: primer = primer + comp[i] return primer com = complement(region) print(f"'complement' len={len(com)} {com}")