CODEWITHSUNDEEP
python
anakin
anakin

Reputation: 365

Python int method

So I have a code, but i'm not sure how it works:

    def getValue(number):
        return int(number,16)

So if I were to put in 'a25' for the number it should return 2597 But my question is how does this int function work, and is there another way to do this?

Upvotes: 0

Views: 360

Answers (2)

smac89
smac89

Reputation: 43147

Assuming number is in base 16, then this function returns the int equivalent of the number.

See this definition of int method

Upvotes: 4

HennyH
HennyH

Reputation: 7944

It works something like this:

import string
allChars = string.digits+string.lowercase #get a list of all the 'characters' which represent digits
def toInt(srep,base):
    charMap = dict(zip(allChars,range(len(allChars)))) #map each 'character' to the base10 number
    num = 0 #the current total
    index = len(srep)-1 #the current exponent
    for digit in srep:
        num += charMap[digit]*base**index
        index -= 1
    return num

The process with some debugging print for interpreting 'a16' would be:

>>> int('a16',16)  #builtin function
2582
>>> toInt('a16',16)
+=10*16^2 -> 2560
+=1*16^1 -> 2576
+=6*16^0 -> 2582
2582

Upvotes: 3

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