Write a dotplot program that reads two proteins from FASTA files specified on the command line (see sys.argv in the Python documentation). The program should output a simple dotplot to the terminal. The dotplot should involve only the first 70 residues of the sequence displayed horizontally and the first 20 residues of the sequence displayed vertically, so as to fit in the standard terminal screen. The first row and the first column should display the two sequences. In the dotplot proper, an asterisk (*) should mark locations corresponding to matching entries, while the rest should be left empty.
Can anyone help me with the code? I dont understand it.