unexplainable python

[Banibrata Dutta]

Without reading or trying to understand the program well enough, at the very
outset, looks like it's a program to convert a set of numeric digits into
it's equivalent whole number representation, in textual form, and that while
author of this piece of code has taken care of english numeric nuances upto
the number 99, he doesn't have anything for hundreds or thousands. So,
feeding a 5-digit code, IMHO would get you to run into a situation where
barring right-most 3 digits, the remaining 2 digits don't have their english
textual names available in the logic.

Why don't you run the thing in a debugger. It's lot easier than adding
prints !!

On Sun, Sep 27, 2009 at 8:07 AM, dads <wayne.dads.bell at gmail.com> wrote:

> When creating a script that converts digits to words I've come across
> some unexplainable python. The script works fine until I use a 5 digit
> number and get a 'IndexError: string index out of range'. After
> looking into it and adding some print calls, it looks like a variable
> changes for no reason. The example beneath is using the digits 34567,
> the _5digit function slices 34 off and passes it to the _2digit
> function, which works with 2 digit strings but the IndexError is
> raised. Please accept my apologies for the explanation, I'm finding it
> hard to put into words. Has anyone any idea why it's acting the way it
> is?
>
> enter number: 34567
> _5digit function used
> 34 before sent to _2digit
> 34 slice when at _2digit function
> 34 before sent to plus_ten function
> 7 slice when at _2digit function
> 7 before sent to plus_ten function
>
>
> from __future__ import print_function
> import sys
>
> class number(object):
>
>    def __init__(self, number):
>
>        #remove any preceding zero's
>        num = int(number)
>        self.num = str(num)
>        self.num = number
>
>        self.single =
> {'0':'zero','1':'one','2':'two','3':'three','4':'four',
>
> '5':'five','6':'six','7':'seven','8':'eight','9':'nine'}
>        self.teen = {'11':'eleven','12':'twelve','13':'thirteen',
>                      '14':'fourteen','15':'fifteen','16':'sixteen',
>
> '17':'seventeen','18':'eighteen','19':'nineteen'}
>        self.plus_ten =
> {'10':'ten','20':'twenty','30':'thirty','40':'forty',
>                          '50':'fifty','60':'sixty','70':'seventy',
>                          '80':'eighty','90':'ninety'}
>        self._translate()
>
>    def _translate(self):
>
>        fns = [ i for i in number.__dict__ if 'digit' in i ]
>        fns.sort()
>        fn_name = fns[len(self.num)-1]
>        print(fn_name,'function used')
>        fn = number.__dict__[fn_name]
>        print(fn(self, self.num))
>
>
>    def _1digit(self, n):
>
>        return self.single[n]
>
>    def _2digit(self, n):
>
>        print(n, 'slice when at _2digit function')
>        if '0' in self.num:
>            return self.plus_ten[n]
>        elif self.num[0] == '1':
>            return self.teen[n]
>        else:
>            print(n,'before sent to plus_ten function')
>            var = self.plus_ten[n[0]+'0'] + ' ' + self._1digit(n[1])
>            return var
>
>    def _3digit(self, n):
>
>        var = self._1digit(n[0]) + ' hundred and ' + self._2digit(n
> [1:])
>        return var
>
>    def _4digit(self, n):
>
>        var = self._1digit(n[0]) + ' thousand ' + self._3digit(n[1:])
>        return var
>
>
>    def _5digit(self, n):
>
>        print(n[:2],'before sent to _2digit')
>        var = self._2digit(n[:2]) + ' thousand ' + self._4digit(n[2:])
>        return var
>
> class control(object):
>
>    def __init__(self):
>        pass
>
>    def data_input(self):
>
>
>        while True:
>            i = raw_input('enter number: ')
>            if i == 's':
>                break
>            #try:
>            n = number(i)
>            #except:
>            #    print('not a number')
>
>
> if __name__ in '__main__':
>    c = control()
>    c.data_input()
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
regards,
Banibrata
http://www.linkedin.com/in/bdutta
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