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POrandint() error 'empty range for randrange' in the python random module
 

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  1. POrandint() error 'empty range for randrange' in the python random module
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    <p>when I use randint() sometimes this error will appear:</p> <pre><code>ValueError: empty range for randrange() (1,1, 0) </code></pre> <p>why is this/how do i stop it from happening?</p> <p>im not doing anything wrong as far as i can tell, this error dosnt apppear on any specific randit() call and only appears every now and then.</p> <p>the error takes me to the actual random module:</p> <pre><code>raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, istop, width) </code></pre> <p>Here is my whole program (i call randint() often)</p> <pre><code> from random import randint units = 5 food = 20 days_without_food = 0 SP = 4 print '------------------------------------------------------' print 'welcome! starting a new game' print '------------------------------------------------------' location = 'plains' def search(): #do2 create leadership skill or search skill global units global food global SP if SP &gt; 0: SP = SP - 1 found = randint(1,3) if found == 1 or found == 2: if units == 0: units = randint(1,5) print '------------------------------------------------------' print 'you recruited %s units!' %units main() a = units / 2 ammount = randint(1,a) units = units + ammount print '------------------------------------------------------' print 'you recruted %s units!' %ammount #recruit a random ammount of units not over half ammount of already owned. main() else: print '------------------------------------------------------' print 'you did not find anything' main() else: print '------------------------------------------------------' print 'your army is too tired to look for anything' main() def battle(): #do1 create villages with a random amount of units between 100-300 global SP global units global food if SP == 0: print '------------------------------------------------------' print 'your army is too tired to fight' main() else: SP = SP -1 if units == 0: print '------------------------------------------------------' print 'it is madness to go looking for a fight without an army' main() a = units / 2 b = units * 2 e_units = randint(a,b) e_units = int(e_units) #random ammount of enemy units reletave to ammount of player units if e_units == 0: e_units = randint(1,3) guess = randint(e_units-5,e_units+5) if guess &lt; 0: guess = randint(1,e_units+10) print '------------------------------------------------------' print 'it looks like the enemy has %s units' %guess #unacurate guess of how many enemy units there are print 'a: attack' print 'b: leave' action = raw_input('a or b?') if action == 'a': units = units - e_units if units &lt;0: units = 0 print '------------------------------------------------------' print 'you lost the battle and all of your units' main() else: a = e_units * 2 ammount = randint(1,a) food = food + ammount print '------------------------------------------------------' print 'you won the battle and found %s food!' %ammount + ' after the battle you have %s units' %units main() # battle else: chance = randint(1,10) if chance == 10: units = units - e_units if units &lt;0: units = 0 #attempt to leve print '------------------------------------------------------' print 'it is to late, they spotted you!' + ' after the battle you have %s units' %units main() else: print '------------------------------------------------------' print 'you leave without the enemy spotting you' main() def change_location(): global food global units global SP global days_without_food if food &lt; 0: days_without_food = days_without_food + 1 if days_without_food &gt; 0 and days_without_food &lt; 3: chance = randint (1,5) if not chance == 5: print '------------------------------------------------------' print 'you have no food, but your men are stll loyal to you' food = 0 main() elif chance == 5: deserters = randint(1,int(units/4)) units = units - deserters print '------------------------------------------------------' print 'without any food, %d men deserted your army' % deserters food = 0 main() else: chance = randint(1,2) if chance == 1: men_starved = randint(1,int(units/4)) units = units - men_starved print '------------------------------------------------------' print 'without any food, %d units starved to death' % men_starved food = 0 main() else: deserters = randint(1,int(units/4)) units = units - deserters print '------------------------------------------------------' print 'without any food, %d men deserted your army' % deserters food = 0 main() days_without_food = 0 SP = 3 food = food - int(units / 2) places = ['plains','beach','river','mountain','sea','desert','hills', 'forest','volcano','jungle','storm','village'] #do3 add more places location = places[randint(0,len(places)-1)] main() def main(): #do1 Create nomadic and settled versions global units global location global food global SP print '------------------------------------------------------' print 'you are at a %s' %location print 'a:look for a fight' print 'b:look for supplies' print 'c:Take stock' print 'd:Move on' action = raw_input('a,b,c, or d?') if action == 'a': battle() elif action == 'b': search() elif action == 'c': print '------------------------------------------------------' print 'food: %s. ' %food + ' units: %s. ' %units + ' Search points %s. ' %SP main() elif action == 'd': change_location() else: main() main() </code></pre>
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    1. USThedudxo
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    2. VO
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    1. COPlease show the code that produces this error
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      1. POrandint() error 'empty range for randrange' in the python random module
      1. USTerryA
    2. COpossible duplicate of [Random module not working. ValueError: empty range for randrange() (1,1, 0)](http://stackoverflow.com/questions/4513818/random-module-not-working-valueerror-empty-range-for-randrange-1-1-0)
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      1. POrandint() error 'empty range for randrange' in the python random module
      1. USjwodder
    3. COMost likely cause is that sometimes you're calling `randint(1, 0)`. If so, stop doing that ;-)
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      1. POrandint() error 'empty range for randrange' in the python random module
      1. USTim Peters
 

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