Among U.S. book publishers (but not newspaper publishers), it is a common typographic practice to capitalize "important" words in titles and headings. This is an old form of emphasis, similar to the more modern practice of using a larger font or a boldface font for titles. This family of typographic conventions is usually called title case.

The rules for which words to capitalize are not based on any grammatically inherent correct/incorrect distinction and are not universally standardized. They are arbitrary and differ between style guides, although most styles they tend to follow a few strong conventions. In general, most styles capitalize all words except for closed-class words: certain parts of speech such as articles (a, an, the), prepositions (in, to, at, …) and conjunctions (and, but, yet, …). The first word of a sentence is always capped, regardless of part of speech.

Assignment

Write a function titleCase that transforms a given sentence into title case. The function should capitalize the first letter of each word, whereas all other letters retain their original spelling. The words of a sentence are defined as the longest possible sequence of letters, quotes (') and hyphens (-). The given sentence must be passed as an argument to the function. The function also has a second optional parameter, that takes a list of words. Words from this list should never be capitalized, unless they appear as the first word of a sentence. Determining if a word belongs to the given list of words should happen case insensitive. The title cased sentence must be returned by the function.

Example

>>> words = ['above', 'about', 'across', 'against', 'along', 'among', 'around', 'at', 'before', 'behind', 'below', 'beneath', 'beside', 'between', 'beyond', 'by', 'down', 'during', 'except', 'for', 'from', 'in', 'inside', 'into', 'like', 'near', 'of', 'off', 'on', 'since', 'to', 'toward', 'through', 'under', 'until', 'up', 'upon', 'with', 'within', 'a', 'the', 'an', 'and', 'but', 'or', 'nor', 'yet', 'so', 'to']

>>> titleCase('Great minds think of great things.')
'Great Minds Think Of Great Things.'

>>> titleCase('Great minds think of great things.', words)
'Great Minds Think of Great Things.'

>>> titleCase("You and I share the same DNA.", words)
'You and I Share the Same DNA.'