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import MySQLdb, subprocess, os, memoize
def percent(n, ntot):
return float(n)/ntot * 100
class BookPlotter(object):
def __init__(self, cx):
self.cx = cx
@ memoize.memoize
def plot(self, kind, datafile):
gnuplot = subprocess.Popen(["gnuplot"], stdin=subprocess.PIPE)
gnuplot.communicate("\n".join(self.gen_histo(kind, datafile)))
def gen_histo(self, kind, datafile):
cu = self.cx.cursor()
cu.execute("""select %s, count(*) from books group by %s
order by %s;""" % (kind, kind, kind))
books_per_kind = cu.fetchall()
xtics = []; i = 0
f = file(datafile, "w")
for k, counts in books_per_kind:
print >> f, counts
xtics.append("%r %s" % (k, i))
i += 1
self.imagefile = os.path.abspath(datafile[:-4] + ".png")
yield "set term png"
yield "set output %r" % self.imagefile
yield "set style fill solid"
yield "set style fill border 2"
yield "set xrange [-1:15]"
yield "set xtics (%s)" % ", ".join(xtics)
yield "plot %r with boxes" % datafile
def show(self):
subprocess.call(["display", self.imagefile])
if __name__ == "__main__":
plotter = BookPlotter(MySQLdb.connect(db="books"))
plotter.plot("genre", "genre.dat")
plotter.show()
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