Python: Integer to Base 32 hex (aka. Triacontakaidecimal)

Ok so going from Base 32 hex (aka. Triacontakaidecimal) to integer is pretty easy for example:

>>>int("v", 32)
31

How do you do it the other way aro开发者_开发技巧und however? I was thinking of setting up a dictionary if a method doesn't exist to do so.

EDIT:

I actually got this working with the dictionary, the idea of my this method was to take a base 32 hex character and increment it if the LSB wasn't set to 1

>>> def incHex(hexChar):
...     intRep = int(hexChar, 32)
...     binRep = bin(intRep)
...     if(binRep[-1:]!='1'):
...         intRep += 1
...     convDict = {0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7,8:8,9:9,10:'A',11:'B',12:'C',
...                 13:'D',14:'E',15:'F',16:'G',17:'H',18:'I',19:'J',20:'K',21:'L',
...                 22:'M',23:'N',24:'O',25:'P',26:'Q',27:'R',28:'S',29:'T',30:'U',
...                 31:'V'}
...     return convDict[intRep]
...
>>> incHex('l')
'L'
>>> incHex('m')
'N'
>>>

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A dictionary is probably a little bit of overkill for what you want to do. Why not just use a tuple:

convTable = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V')

That will make lookups faster while saving you memory as well.

If you are just looking up integers in the range 0-31 then you can just do:

getHex32Rep(val):
    return convTable[val]

Also, you probably want to do:

if(binRep[-1]!='1'):

instead of

if(binRep[-1:]!='1'):

---

another way to make the convDict

>>> import string
>>> convDict = {c:int(c,32) for c in (string.digits+string.ascii_lowercase)[:32]}
>>> convDict
{'1': 1, '0': 0, '3': 3, '2': 2, '5': 5, '4': 4, '7': 7, '6': 6, '9': 9, '8': 8, 'a': 10, 'c': 12, 'b': 11, 'e': 14, 'd': 13, 'g': 16, 'f': 15, 'i': 18, 'h': 17, 'k': 20, 'j': 19, 'm': 22, 'l': 21, 'o': 24, 'n': 23, 'q': 26, 'p': 25, 's': 28, 'r': 27, 'u': 30, 't': 29, 'v': 31}

---

I found the numconv package, which seems to provide this?

---

A decade later, (January 2021)

I found the following package:

https://pypi.org/project/base32-crockford/

base32-crockford

A Python module implementing the alternate base32 encoding as described by Douglas Crockford at: http://www.crockford.com/wrmg/base32.html.

He designed the encoding to:

    Be human and machine readable
    Be compact
    Be error resistant
    Be pronounceable

It uses a symbol set of 10 digits and 22 letters, excluding I, L O and U. Decoding is not case sensitive, and 'i' and 'l' are converted to '1' and 'o' is converted to '0'. Encoding uses only upper-case characters.

Hyphens may be present in symbol strings to improve readability, and are removed when decoding.

A check symbol can be appended to a symbol string to detect errors within the string.