How to make R and Python scripts, and make them executable

While practicing my R and Python skills, I have written a script in both R and Python that will perform the same task. Namely take a DNA sequence from a fasta file, count it’s length, and the number of G’s, C’s and N’s while taking upper and lowercase format into account. Then it prints a message with the calculation results. I also included a step that will count how many seconds it takes to do the the calculations, so we can compare which script runs fastest.