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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision 91f87ca69b0288010d6fd5743797dfc93361aa49 authored by Guido van Rossum on 30 July 1996, 20:45:45 UTC, committed by Guido van Rossum on 30 July 1996, 20:45:45 UTC
1 parent e288f9d
Tip revision: 91f87ca69b0288010d6fd5743797dfc93361aa49 authored by Guido van Rossum on 30 July 1996, 20:45:45 UTC
Note that the values are ints.
Note that the values are ints.
Tip revision: 91f87ca
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()
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