Like:
    12345 = "twelve thousand three hundred and fourty five"
    97835200 ="Nine core seventy eight lakh thirty five thousand two hundred"
    230100 = "Two lakh thirty thousand one hundred"

>>>def handel_upto_99(number):
predef={0:"zero",1:"one",2:"two",3:"three",4:"four",5:"five",6:"six",7:"seven",8:"eight",9:"nine",10:"ten",11:"eleven",12:"twelve",13:"thirteen",14:"fourteen",15:"fifteen",16:"sixteen",17:"seventeen",18:"eighteen",19:"nineteen",20:"twenty",30:"thirty",40:"fourty",50:"fifty",60:"sixty",70:"seventy",80:"eighty",90:"ninety",100:"hundred",100000:"lakh",10000000:"crore",1000000:"million",1000000000:"billion"}
if number in predef.keys():
    return predef[number]
else:
    return predef[(number/10)*10]+' '+predef[number%10]

>>>def return_bigdigit(number,devideby):
predef={0:"zero",1:"one",2:"two",3:"three",4:"four",5:"five",6:"six",7:"seven",8:"eight",9:"nine",10:"ten",11:"eleven",12:"twelve",13:"thirteen",14:"fourteen",15:"fifteen",16:"sixteen",17:"seventeen",18:"eighteen",19:"nineteen",20:"twenty",30:"thirty",40:"fourty",50:"fifty",60:"sixty",70:"seventy",80:"eighty",90:"ninety",100:"hundred",1000:"thousand",100000:"lakh",10000000:"crore",1000000:"million",1000000000:"billion"}
if devideby in predef.keys():
    return predef[number/devideby]+" "+predef[devideby]
else:
    devideby/=10
    return handel_upto_99(number/devideby)+" "+predef[devideby]

>>>def mainfunction(number):
dev={100:"hundred",1000:"thousand",100000:"lakh",10000000:"crore",1000000000:"billion"}
if number is 0:
    return "Zero"
if number<100:
    result=handel_upto_99(number)

else:
    result=""
    while number>=100:
        devideby=1
        length=len(str(number))
        for i in range(length-1):
            devideby*=10
        if number%devideby==0:
            if devideby in dev:
                return handel_upto_99(number/devideby)+" "+ dev[devideby]
            else:
                return handel_upto_99(number/(devideby/10))+" "+ dev[devideby/10]
        res=return_bigdigit(number,devideby)
        result=result+' '+res
        if devideby not in dev:
            number=number-((devideby/10)*(number/(devideby/10)))
        number=number-devideby*(number/devideby)

    if number <100:
        result = result + ' '+ handel_upto_99(number)
return result

>>>mainfunction(12345)
' twelve thousand three hundred fourty five'

>>>mainfunction(0)
'Zero'

>>>mainfunction(100)
'one hundred'

>>>mainfunction(40230534)
' four crore two lakh thirty thousand five hundred thirty four'

num2word.to_card(1e25)
'ten septillion, one billion, seventy-three million, seven hundred and forty-one


this will avoid your long code and you can directly use it.

def int2word(n):
"""
convert an integer number n into a string of english words
"""
# break the number into groups of 3 digits using slicing
# each group representing hundred, thousand, million, billion, ...
n3 = []
r1 = ""
# create numeric string
ns = str(n)
for k in range(3, 33, 3):
    r = ns[-k:]
    q = len(ns) - k
    # break if end of ns has been reached
    if q < -2:
        break
    else:
        if  q >= 0:
            n3.append(int(r[:3]))
        elif q >= -1:
            n3.append(int(r[:2]))
        elif q >= -2:
            n3.append(int(r[:1]))
    r1 = r

#print n3  # test

# break each group of 3 digits into
# ones, tens/twenties, hundreds
# and form a string
nw = ""
for i, x in enumerate(n3):
    b1 = x % 10
    b2 = (x % 100)//10
    b3 = (x % 1000)//100
    #print b1, b2, b3  # test
    if x == 0:
        continue  # skip
    else:
        t = thousands[i]
    if b2 == 0:
        nw = ones[b1] + t + nw
    elif b2 == 1:
        nw = tens[b1] + t + nw
    elif b2 > 1:
        nw = twenties[b2] + ones[b1] + t + nw
    if b3 > 0:
        nw = ones[b3] + "hundred " + nw
return nw

'''Global'''

ones = ["", "one ","two ","three ","four ", "five ",
"six ","seven ","eight ","nine "]

tens = ["ten ","eleven ","twelve ","thirteen ", "fourteen ",
"fifteen ","sixteen ","seventeen ","eighteen ","nineteen "]

twenties = ["","","twenty ","thirty ","forty ",
"fifty ","sixty ","seventy ","eighty ","ninety "]

thousands = ["","thousand ","million ", "billion ", "trillion ",
"quadrillion ", "quintillion ", "sextillion ", "septillion ","octillion ",
"nonillion ", "decillion ", "undecillion ", "duodecillion ", "tredecillion ",
"quattuordecillion ", "sexdecillion ", "septendecillion ", "octodecillion ",
"novemdecillion ", "vigintillion "]