convert the number from international system to indian system using python

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2
3import decimal
4
5def currencyInIndiaFormat(n):
6  d = decimal.Decimal(str(n))
7  if d.as_tuple().exponent < -2:
8    s = str(n)
9  else:
10    s = '{0:.2f}'.format(n)
11  l = len(s)
12  i = l-1;
13  res = ''
14  flag = 0
15  k = 0
16  while i>=0:
17    if flag==0:
18      res = res + s[i]
19      if s[i]=='.':
20        flag = 1
21    elif flag==1:
22      k = k + 1
23      res = res + s[i]
24      if k==3 and i-1>=0:
25        res = res + ','
26        flag = 2
27        k = 0
28    else:
29      k = k + 1
30      res = res + s[i]
31      if k==2 and i-1>=0:
32        res = res + ','
33        flag = 2
34        k = 0
35    i = i - 1