[CentralOH] chr()/ord() Ugliness

[William McVey]

[I've reorganized your reply to my mail for clarity in the answer]
> I understand 'hello world'.upper(), but not string.upper[i].
That was my mistake. I meant to type string.uppercase[i]:

     >>> i=5
     >>> chr(ord('A') + i)
    'F'
     >>> import string
     >>> string.uppercase
    'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
     >>> string.uppercase[i]
    'F'


On 11/11/2013 10:29 AM, jep200404 at columbus.rr.com wrote:
> I want to get a letter that is i greater than 'A',
> while iterating over arbitrary iterable.
What happens if your iterable is longer than the number of letters. Do 
you want to wrap around back to 'a' again? Do you want to start pulling 
in punctuation? Lowercase letters? The assumption seems to be that 
you're dealing with ascii, but when you say "letter greater than 'A'", 
do you mean by unicode codepoint? ASCII/UTF-8 encoding?
> Imagine something like:
>
>      for i, foo in enumerate(bar):
>          print 'Entity %s is %s' % (chr(ord('A') + i), foo)

I think I'd probably chose to use itertools rather than using enumerate 
to pull offsets. For example:

     >>> import string, itertools
     >>> lorem_words=""""Lorem ipsum dolor sit amet, consectetur
    adipisicing elit, sed do eiusmod tempor incididunt ut labore et
    dolore magna aliqua. Ut enim ad minim veniam, quis nostrud
    exercitation ullamco laboris nisi ut aliquip ex ea commodo
    consequat. Duis aute irure dolor in reprehenderit in voluptate velit
    esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat
    cupidatat non proident, sunt in culpa qui officia deserunt mollit
    anim id est laborum.""".split()

     >>> list(itertools.izip(itertools.cycle(string.uppercase),
    lorem_words))
    [('A', '"Lorem'), ('B', 'ipsum'), ('C', 'dolor'), ('D', 'sit'),
    ('E', 'amet,'), ('F', 'consectetur'), ('G', 'adipisicing'), ('H',
    'elit,'), ('I', 'sed'), ('J', 'do'), ('K', 'eiusmod'), ('L',
    'tempor'), ('M', 'incididunt'), ('N', 'ut'), ('O', 'labore'), ('P',
    'et'), ('Q', 'dolore'), ('R', 'magna'), ('S', 'aliqua.'), ('T',
    'Ut'), ('U', 'enim'), ('V', 'ad'), ('W', 'minim'), ('X', 'veniam,'),
    ('Y', 'quis'), ('Z', 'nostrud'), ('A', 'exercitation'), ('B',
    'ullamco'), ('C', 'laboris'), ('D', 'nisi'), ('E', 'ut'), ('F',
    'aliquip'), ('G', 'ex'), ('H', 'ea'), ('I', 'commodo'), ('J',
    'consequat.'), ('K', 'Duis'), ('L', 'aute'), ('M', 'irure'), ('N',
    'dolor'), ('O', 'in'), ('P', 'reprehenderit'), ('Q', 'in'), ('R',
    'voluptate'), ('S', 'velit'), ('T', 'esse'), ('U', 'cillum'), ('V',
    'dolore'), ('W', 'eu'), ('X', 'fugiat'), ('Y', 'nulla'), ('Z',
    'pariatur.'), ('A', 'Excepteur'), ('B', 'sint'), ('C', 'occaecat'),
    ('D', 'cupidatat'), ('E', 'non'), ('F', 'proident,'), ('G', 'sunt'),
    ('H', 'in'), ('I', 'culpa'), ('J', 'qui'), ('K', 'officia'), ('L',
    'deserunt'), ('M', 'mollit'), ('N', 'anim'), ('O', 'id'), ('P',
    'est'), ('Q', 'laborum.')]

Note that in this case, I used itertools.cycle to basically repeat the 
uppercase letter string... However, you could choose to feed the izip 
other well known strings (strings.letters and strings.printable are 
possibly good options). The izip() returns an iterable that emits tuples 
composed of one element off of each of it's set of (iterable) arguments 
in turn. The conversion of the izip iterator into a list was simply for 
display purposes. You wouldn't need/want this in your actual code.

   -- William

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