solution_122w.py

infile = 'md0x.md'

with open(infile,'r') as fin:

    for line in fin:

        print('----------------------------')
        print(f'length of line: {len(line)}')
        
        line = line.strip().strip('\n')
        print(f'length of line: {len(line)} (stripped)')
        print('12345678901234567890')
        print(line)


        rline = rf'{line}'
        print(f'length of rline: {len(rline)} (f string)')        
        print('12345678901234567890')
        print(rline)

       
        rrline = '{x}'.format(x=line)
        print(f'length of rrline: {len(rrline)} (.format())')        
        print('12345678901234567890')
        print(rrline)

           
        rrrline = repr(line)
        print(f'length of rrrline: {len(rrrline)} (repr())')        
        print('12345678901234567890')
        print(rrrline)