Question 1 - Open a PDB file

Check whether file follows PDB format

Requirements Each line is 80 columns wide First 6 chars of each line must have a record name:

HEADER
TITLE
DBREF
SEQRES
HELIX
SHEET

Print message asking for confirmation to replace file

Question 2 - Information

Question 3 - Histogram of amino acids

Question 4 - Secondary structure

Make it work with unique chains instead of hard coding A and B

Figure out why the PDF solution could be different from yours

Add tests for secondary structure

Question 5 - Exit

Test

Use pytest tmp_path