79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# Sudoku auto-solver. Get today's sudoku at http://www.sudoku.org.uk/daily.asp
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# and solve it
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import urllib
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from HTMLParser import HTMLParser, HTMLParseError
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from pyswip.prolog import Prolog
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from pyswip.easy import *
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URL = "http://www.sudoku.org.uk/daily.asp"
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class DailySudokuPuzzle(HTMLParser):
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def __init__(self):
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self.puzzle = []
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self.__in_td = False
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HTMLParser.__init__(self)
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def handle_starttag(self, tag, attrs):
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if tag == "td":
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for attr in attrs:
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if attr[0] == "class" and attr[1] == "InnerTDone":
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self.__in_td = True
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break
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elif tag == "input":
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if self.__in_td:
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self.puzzle.append(0)
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def handle_endtag(self, tag):
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if tag == "td":
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self.__in_td = False
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def handle_data(self, data):
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if self.__in_td:
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self.puzzle.append(int(data))
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def pretty_print(table):
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print "".join(["/---", "----"*8, "\\"])
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for row in table:
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print "".join(["|", "|".join(" %s " % (i or " ") for i in row), "|"])
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print "".join(["\\---", "----"*8, "/"])
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def get_daily_sudoku(url):
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puzzle = DailySudokuPuzzle()
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f = urllib.urlopen(url)
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try:
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puzzle.feed(f.read())
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except HTMLParseError:
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pass
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puzzle = puzzle.puzzle
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return [puzzle[i*9:i*9+9] for i in range(9)]
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def solve(problem):
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prolog.consult("sudoku.pl")
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p = str(problem).replace("0", "_")
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result = list(prolog.query("Puzzle=%s,sudoku(Puzzle)" % p, maxresult=1))
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if result:
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result = result[0]
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return result["Puzzle"]
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else:
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return False
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if __name__ == "__main__":
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prolog = Prolog() # having this in `solve` bites! because of __del__
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print "Getting puzzle from:", URL
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puzzle = get_daily_sudoku(URL)
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print "-- PUZZLE --"
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pretty_print(puzzle)
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print
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print " -- SOLUTION --"
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solution = solve(puzzle)
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if solution:
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pretty_print(solution)
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else:
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print "This puzzle has no solutions [is it valid?]"
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