Added number to word convertor in Python

Num_to_words.py

@@ -0,0 +1,36 @@
+# This code will convert any whole number to word in Indian number system
+def num_to_wds_indi(num):
+    d = {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 : 'forty', 50 : 'fifty', 60 : 'sixty',
+          70 : 'seventy', 80 : 'eighty', 90 : 'ninety'}
+    th = 1000
+    lk = th * 100
+    cr = lk * 100
+
+    assert(0<=num)
+
+    if(num<20):
+        return d[num]
+    if(num<100):
+        if(num % 10 == 0): return d[num]
+        else: return d[num//10*10] + ' ' + d[num%10]
+    if(num<th):
+        if(num % 100 == 0): return d[num//100] + ' hundred'
+        else: return d[num//100] + ' hundred and ' + num_to_wds_indi(num%100)
+    if(num<lk):
+        if(num % th == 0): return num_to_wds_indi(num//th) + ' thousand'
+        else: return num_to_wds_indi(num//th) + ' thousand, ' + num_to_wds_indi(num%th)
+    if(num<cr):
+        if(num % lk == 0): return num_to_wds_indi(num//lk) + ' lakh'
+        else: return num_to_wds_indi(num//lk) + ' lakh, ' + num_to_wds_indi(num%lk)
+
+    if(num % cr == 0): return num_to_wds_indi(num//cr) + ' crore'
+    else: return num_to_wds_indi(num//cr) + ' crore, ' + num_to_wds_indi(num%cr)
+    raise AssertionError('num is too large: %s' % str(num))
+
+num = int(input())
+print(num_to_wds_indi(num))