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Parse Numbers Written in English

This function, when passed a string such as “six hundred twenty two,” should return the numerical value. It should handle numbers up to 999,999,999.

This function ignores the word “and” anywhere it appears in the input string.

Source Code

						1.     """ Define a dictionary mapping between English words
 2.         and the corresponding numbers.
 3.     """
 4.     digitmap = {
 5.         "zero" : 0,
 6.         "one" : 1,
 7.         "two" : 2,
 8.         "three" : 3,
 9.         "four" : 4,
10.         "five" : 5,
11.         "six" : 6,
12.         "seven" : 7,
13.         "eight" : 8,
14.         "nine" : 9,
15.         "ten" : 10,
16.         "eleven" : 11,
17.         "twelve" : 12,
18.         "thirteen" : 13,
19.         "fourteen" : 14,
20. "fifteen" ...