Chr() arg not in range python -


i have been creating program, , part of involves modifying list of characters @ random:

    while rel>0:         pos = random.randint(0,len(out)-1)         change = random.randint(-1*rel,rel)         if (change+ord(out[pos]))>=255:             change = 255-ord(out[pos])         elif ((ord(out[pos]))-change)<=0:             change = -1*(ord(out[pos]))         out[pos] = chr(ord(out[pos])+change)         rel -= abs(change)

here, rel 'currency' program using modify list of characters out. first chooses random position in list, , random amount of change position between -rel , +rel, changes value of character using chr(ord(out[pos])+change). giving me error new modified value character out of range(256), added 2 if statements executed before changing character, still returns error, large values of rel. how can stop this?

the problem in choice of translation checks.

elif ((ord(out[pos]))-change)<=0:

why difference meaningful? of other operations on sum of char , change. error when change < -ord(out[pos]): neither if nor elif condition true, wind taking chr of negative number.

change minus plus, , should fine, until values of rel beyond 512. if possible, please consider using modulus (%) instead of simple subtraction.

it took me couple of minutes trace this. cleaned program , added pair of tracing prints find out what's going on.

import random out = list("now time parties") rel = 500  while rel > 0:     pos = random.randint(0, len(out)-1)     chord = ord(out[pos])     change = random.randint(-rel, rel)     print "a", chord, change     if change + chord >= 255:         change = 255 - chord     elif chord + change <= 0:         change = -chord     print "b", chord, change     out[pos] = chr(chord + change)     rel -= abs(change)  print ''.join(out)

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