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v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 7c7fa46d204679287b48f1cf8d867aab4de2894e authored by cvs2svn on 10 November 1994, 23:06:54 UTC
This commit was manufactured by cvs2svn to create tag 'release111'.
This commit was manufactured by cvs2svn to create tag 'release111'.
Tip revision: 7c7fa46
markov.py
#! /usr/local/bin/python
class Markov:
def __init__(self, histsize, choice):
self.histsize = histsize
self.choice = choice
self.trans = {}
def add(self, state, next):
if not self.trans.has_key(state):
self.trans[state] = [next]
else:
self.trans[state].append(next)
def put(self, seq):
n = self.histsize
add = self.add
add(None, seq[:0])
for i in range(len(seq)):
add(seq[max(0, i-n):i], seq[i:i+1])
add(seq[len(seq)-n:], None)
def get(self):
choice = self.choice
trans = self.trans
n = self.histsize
seq = choice(trans[None])
while 1:
subseq = seq[max(0, len(seq)-n):]
options = trans[subseq]
next = choice(options)
if not next: break
seq = seq + next
return seq
def test():
import sys, string, whrandom, getopt
args = sys.argv[1:]
try:
opts, args = getopt.getopt(args, '0123456789cdw')
except getopt.error:
print 'Usage: markov [-#] [-cddqw] [file] ...'
print 'Options:'
print '-#: 1-digit history size (default 2)'
print '-c: characters (default)'
print '-w: words'
print '-d: more debugging output'
print '-q: no debugging output'
print 'Input files (default stdin) are split in paragraphs'
print 'separated blank lines and each paragraph is split'
print 'in words by whitespace, then reconcatenated with'
print 'exactly one space separating words.'
print 'Output consists of paragraphs separated by blank'
print 'lines, where lines are no longer than 72 characters.'
histsize = 2
do_words = 0
debug = 1
for o, a in opts:
if '-0' <= o <= '-9': histsize = eval(o[1:])
if o == '-c': do_words = 0
if o == '-d': debug = debug + 1
if o == '-q': debug = 0
if o == '-w': do_words = 1
if not args: args = ['-']
m = Markov(histsize, whrandom.choice)
try:
for filename in args:
if filename == '-':
f = sys.stdin
if f.isatty():
print 'Sorry, need stdin from file'
continue
else:
f = open(filename, 'r')
if debug: print 'processing', filename, '...'
text = f.read()
f.close()
paralist = string.splitfields(text, '\n\n')
for para in paralist:
if debug > 1: print 'feeding ...'
words = string.split(para)
if words:
if do_words: data = tuple(words)
else: data = string.joinfields(words, ' ')
m.put(data)
except KeyboardInterrupt:
print 'Interrupted -- continue with data read so far'
if not m.trans:
print 'No valid input files'
return
if debug: print 'done.'
if debug > 1:
for key in m.trans.keys():
if key is None or len(key) < histsize:
print `key`, m.trans[key]
if histsize == 0: print `''`, m.trans['']
print
while 1:
data = m.get()
if do_words: words = data
else: words = string.split(data)
n = 0
limit = 72
for w in words:
if n + len(w) > limit:
print
n = 0
print w,
n = n + len(w) + 1
print
print
def tuple(list):
if len(list) == 0: return ()
if len(list) == 1: return (list[0],)
i = len(list)/2
return tuple(list[:i]) + tuple(list[i:])
test()