[Tutor] More problems with Learning Python example

[->Terry<-]

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Thanks Danny and Bob. Your explanations not only helped
me solve the error, but understand why i got the error.

Unfortunately, I have run into another problem with the
same example. Here is where I'm at now:

My system is Slackware 10.1 and Python version is 2.4.1

- --------------------------------
* makezeros.py
- --------------------------------

def lots_of_appends():
     zeros = []
     for i in range(10000):
         zeros.append(0)

def one_multiply():
     zeros = [0] * 10000


- --------------------------------
* corrected timings.py
- --------------------------------

import time, makezeros
def do_timing(num_times, *funcs):
     totals = {}
     for func in funcs:
         totals[func] = 0.0
         starttime = time.clock()        # record starting time
         for x in range(num_times):
             for func in funcs:
                 apply(func)
         stoptime = time.clock()          # record ending time
         elapsed = stoptime - starttime   # difference yields time elapsed
         totals[func] = totals[func] + elapsed
     for func in funcs:
         print "Running %s %d times took %.3f seconds" % (func.__name__, 
num_times, totals[func])

do_timing(100, makezeros.lots_of_appends, makezeros.one_multiply)


- -------------------------------
* new error message
- -------------------------------

Traceback (most recent call last):
   File "timings.py", line 16, in ?
     do_timing(100, makezeros.lots_of_appends, makezeros.one_multiply)
   File "timings.py", line 12, in do_timing
     totals[func] = totals[func] + elapsed
KeyError: <function one_multiply at 0x403eaf0c>


help(KeyError) tells me Mapping key not found. Have I
stumbled on another error in the book? I don't know
how to proceed in tracking this down. any suggestions?

Thanks again,
- -- 
     Terry

      ,-~~-.___.     Terry Randall <tvbareATsocketDOTnet>
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