Adding common doctor titles

[lrhache]

Doctor of Medicine (M.D.) and Doctor of Osteopathic Medicine (D.O.) are commonly used as suffix or prefix in a name (with or w/o the dot notation)
IE: Louis Hache, M.D.

[derek73]

I don't think adding these to the titles would cause a problem because they are not likely to also be first names (though part of me wonders if someone named Do is going to email me someday to complain that the parser thinks his name is a title).

But adding these to the titles would support them at the beginning of the name, so "M.D. Louis Hache" or "Hache, M.D. Louis". Is that really what you want? The parser already correctly parses the example you provided:

$ python tests.py "Louis Hache, M.D."
<HumanName : [
    title: '' 
    first: 'Louis' 
    middle: '' 
    last: 'Hache' 
    suffix: 'M.D.'
    nickname: ''
]>

Or, maybe you want "title" to be more semantic rather than positional like #2?