[Tutor] complex iteration over a list (original) (raw)

Michele Alzetta michele.alzetta at aliceposta.it
Fri Jul 2 14:03:04 EDT 2004

Hallo all !

I'm stuck on the following type of code (still working on classes that handle periods of time).

I have a list called months:

months = [31,28,31,30,31,30,31,31,30,31,30,31] daysinperiod = [] startday, numberofdays, index = 10, 40, 5

actual value of these has been determined previously

in my program, I am just assigning them directly now to

keep things simple

for day in range(startday,numberofdays):

the range is a period of time, in this case, from the 10th

of June to the 20th of July

if day <= months[index]:
    daysinperiod.append(day)
if day > months[index]:
    daysinperiod.append(day-months[index])

print daysinperiod

The output I want is a list like this: 10,11,..,30,1,2,...,19

Above code works perfectly in this case, but it doesn't if numberofdays is > 51 of course. To have this work for periods that overlap the end of two or more months I would have to be able to change the value of "index" in my recursion somehow ... ? For all practical purposes I could simply forbid the case where the length of my time period is too long, but supposing in the future I wanted to adapt this class for other things ? Besides, the purpose of this whole thing is learning !

I could also look into the calendar module... (which will probably end up being the simplest way of handling this). But I keep on feeling there ought to be an elegant way to do this even without calendar. Any suggestions ?

-- Michele Alzetta <michele.alzetta at aliceposta.it>

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