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text2num.py
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text2num.py
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# This library is a simple implementation of a function to convert textual
# numbers written in English into their integer representations.
#
# This code is open source according to the MIT License as follows.
#
# Copyright (c) 2008 Greg Hewgill
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
import re
Small = {
'zero': 0,
'one': 1,
'two': 2,
'three': 3,
'four': 4,
'five': 5,
'six': 6,
'seven': 7,
'eight': 8,
'nine': 9,
'ten': 10,
'eleven': 11,
'twelve': 12,
'thirteen': 13,
'fourteen': 14,
'fifteen': 15,
'sixteen': 16,
'seventeen': 17,
'eighteen': 18,
'nineteen': 19,
'twenty': 20,
'thirty': 30,
'forty': 40,
'fifty': 50,
'sixty': 60,
'seventy': 70,
'eighty': 80,
'ninety': 90
}
Magnitude = {
'thousand': 1000,
'million': 1000000,
'billion': 1000000000,
'trillion': 1000000000000,
'quadrillion': 1000000000000000,
'quintillion': 1000000000000000000,
'sextillion': 1000000000000000000000,
'septillion': 1000000000000000000000000,
'octillion': 1000000000000000000000000000,
'nonillion': 1000000000000000000000000000000,
'decillion': 1000000000000000000000000000000000,
}
class NumberException(Exception):
def __init__(self, msg):
Exception.__init__(self, msg)
def text2num(s):
a = re.split(r"[\s-]+", s)
n = 0
g = 0
for w in a:
x = Small.get(w, None)
if x is not None:
g += x
elif w == "hundred" and g != 0:
g *= 100
else:
x = Magnitude.get(w, None)
if x is not None:
n += g * x
g = 0
else:
raise NumberException("Unknown number: "+w)
return n + g
if __name__ == "__main__":
assert 1 == text2num("one")
assert 12 == text2num("twelve")
assert 72 == text2num("seventy two")
assert 300 == text2num("three hundred")
assert 1200 == text2num("twelve hundred")
assert 12304 == text2num("twelve thousand three hundred four")
assert 6000000 == text2num("six million")
assert 6400005 == text2num("six million four hundred thousand five")
assert 123456789012 == text2num("one hundred twenty three billion four hundred fifty six million seven hundred eighty nine thousand twelve")
assert 4000000000000000000000000000000000 == text2num("four decillion")