Christian Witts wrote:
> On 08/02/2011 15:04, tee chwee liong wrote:
>> hi all,
>>
>> thanks for the advice. i modified my code to be:
>>
>> c=('01101')
>> i=-1
>> try:
>> while 1:
>> i=c.index('0',i+1)
>> print "Lane fail",i
>> except ValueError:
>> print "All Lanes PASS"
>> pass
>>
>> when i run, the result is:
>>
>> >>>
>> Lane fail 0
>> Lane fail 3
>> All Lanes PASS
>>
>> Question: How do i prevent the code from executing the except
>> ValueError part. it seems to be checking bit by bit and when is see 1
>> it will execute the except part.
>> i just want the results to be:
>> >>>
>> Lane fail 0
>> Lane fail 3
> `while i < len(c)` instead of `while 1`
You have an off-by-one bug. But even if you fix that you'll still enter the
except suite if the string c doesn't end with a "0". You need to keep track
of the failed lanes, e. g.:
for c in "011010", "111", "000", "", "1", "0", "001":
print c.center(20, "-")
i = -1
all_passed = True
try:
while True:
i = c.index('0', i+1)
print "Lane fail", i
all_passed = False
except ValueError:
pass
if all_passed:
print "All Lanes PASS"
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