[Tutor] accessing dynamically created py objects

[Baker, Michael]

yes thanks that'll do

here's my code:

def getStop(stops,awards,weightranges,iterations=1):
    t1=time()
    ran=random
    STOPS={}
    print "i'm workin..."
    for item in range(len(stops)):
        STOPS["STOP"+str(item)]=0.0
    for a in range(iterations):
        r=ran()*weightranges[-1]
        for n in weightranges:
            if r<=n:
                #get slice index - NOT STOP NUMBER!
                st=weightranges.index(n)
                break
            
        stop=stops[st]
        award=awards[st]
        STOPS['STOP'+str(stop)]+=1
        #sort
        
    print "...ok i'm done"

    for d in STOPS.keys():
        STOPS[d]=STOPS[d]/iterations*100
    print "process took ",time()-t1," seconds"    
    return [stop,award,STOPS]

>>> stops=[0,1,2,3,4,5,6,7,8,9]
>>> awards=[2500,500,250,100,75,60,50,45,35,25]
>>> weights=[1,3,8,14,22,32,62,132,482,812]
>>> s=getStop(stops,awards,weights,1000000)
i'm workin...
...ok i'm done
28.2400000095  seconds
>>> s
[7, 35, {'STOP2': 0.23540000000000003, 'STOP3': 40.566800000000001, 'STOP0':
0.1245, 'STOP1': 3.7212000000000001, 'STOP6': 0.97499999999999998, 'STOP7':
43.130600000000001, 'STOP4': 0.62319999999999998, 'STOP5':
8.6646000000000001, 'STOP8': 0.74390000000000001, 'STOP9':
1.2148000000000001}]

-----Original Message-----
From: Kirby Urner [mailto:urnerk@qwest.net]
Sent: Wednesday, January 09, 2002 1:22 PM
To: Baker, Michael
Cc: 'tutor@python.org'
Subject: Re: [Tutor] accessing dynamically created py objects



>
>how can i make this work??
>
>thanks in advance
>mb

To me, it makes more sense to create your N0..Nn as keys
to a dictionary, and then use these to map to values.
If you need multiple values, you could map to lists.  e.g.

  >>> gens = {}
  >>> def maker(n):
         for i in range(n):
           gens["N"+str(i)]=[0,0]


  >>> maker(5)
  >>> gens
  {'N0': [0, 0], 'N1': [0, 0], 'N2': [0, 0], 'N3': [0, 0], 'N4': [0, 0]}

Here each Nn is paired with [0,0] i.e. you could populate either
or both elements.

Now you can go:

  >>> gens['N4'][0] += 1  # increment 0th element of N4 list
  >>> gens
  {'N0': [0, 0], 'N1': [0, 0], 'N2': [0, 0], 'N3': [0, 0],
  'N4': [1, 0]}

It's easier to mass-create distinct entities using some
data structure than to synthesize variables at the
outermost (module) level.

Kirby