[Tutor] for loop issue

[Adam Bark]

2009/10/9 Stefan Lesicnik <stefan at lsd.co.za>

Hi,
>
> This feels like a strange issue, so i hope I formulate this so its
> understandable.
>
> I have some objects. Each object has associated values. I am looping
> through these objects, working with a value and printing out the
> value.
> The issue in this case is that i need to check if the one value
> superseeds the other, and in that case, not print it out. I think the
> problem is that when you are in the loop, you dont know about the
> other object that you havent processed yet, and when you are
> processing that object, you dont know about the previous one?  (not
> 100% sure if this assumption is correct)
>
> eg of my data  (im comparing ubuntu -> debian security fixes and the
> data comes from https://edge.launchpad.net/ubuntu/+source/openswan)
> You can see what i have so far here -
> http://people.ubuntu.com/~stefanlsd/synclist.html<http://people.ubuntu.com/%7Estefanlsd/synclist.html>
>
> The Jaunty Jackalope  (current stable release)
> Show details 1:2.4.12+dfsg-1.3+lenny2build0.9.04.1      updates, security
> (universe)      two days ago
> Show details 1:2.4.12+dfsg-1.3  release (universe)      49 weeks ago
>
> In the above case, the first loop goes through
> 1:2.4.12+dfsg-1.3+lenny2build0.9.04.1. At this point i need it to stop
> without checking the next entry 1:2.4.12+dfsg-1.3 as the former
> superseeds it.
> I understand that I can use a break to exit the loop, but i run a
> whole bunch of things after this check, so i dont want to break out of
> it.
>
> Is this possible what i'm doing? or have i architected the loop wrong
> so i 'should' be able to break out of it.
>
> Thanks in advance!
>
> stefan
>
>
> snippet of code below if its of any use...
>
>
> for app in apps:
>            print('app in apps: %s' % app)
>            for item in series:
>                print('item in series: %s' % item)
>                debian_series = item[0]
>                debian_fullversion = item[2]
>                print('debian_series: %s' % debian_series)
>                print('debian_fullversion: %s' % debian_fullversion)
>
>                debian_version =
> re.sub('\+?(etch|lenny|sarge|squeeze|woody)[0-9]+$', '',
> debian_fullversion)
>                print('debian_version: %s' % debian_version)
>
>                main_archive =
> launchpad.distributions['ubuntu'].main_archive
>                #TODO - May be able to use a version check in the
> publishedsource to increase speed of checking
>                publishedsource =
> main_archive.getPublishedSources(source_name = app,
> status='Published', exact_match=True)
>
>                for source in publishedsource:
>
>                    if source.distro_series.active:
>                        print source.distro_series.name,
> source.source_package_version
>                        ubuntu_fullversion = source.source_package_version
>                        print('ubuntu fullversion before: %s' %
> ubuntu_fullversion)
>                        ubuntu_version =
> re.sub('build0.[0-9]+.[0-9][0-9].[0-9]+$', '', ubuntu_fullversion)
>                        #ubuntu_version =
> re.sub('\+?(etch|lenny|sarge|squeeze|woody)[0-9]+$', '',
> ubuntu_version)
>                        print('ubuntu version after: %s' % ubuntu_version)
>                        #ubuntu_target = ('%subuntu/+source/%s') %
> (launchpad._root_uri,app)
>
>                        if debian_fullversion == ubuntu_version:
>                            continue
>
>                        if debian_version in ubuntu_fullversion:
>                            ubuntu_component = source.component_name
>                            ubuntu_series = source.distro_series.name
>                            ubuntu_pocket = source.pocket
>                            print('ubuntu_pocket: %s' % ubuntu_pocket)
>                            print('debian version: %s' % debian_version)
>
>                            #If pocket is Security, no need to check further
>                            if ubuntu_pocket == 'Security' or
> ubuntu_pocket == 'Updates':
>                                print('Not Found version in: %s.
> Continue' % ubuntu_pocket)
>                                break
>
>                            if debian_version == ubuntu_version:
>                                matchtype = 'Sync Match'
>                            else:
>                                matchtype = 'MoM Match'
>
>                            ubuntu_changelog = '<a
> href=http://changelogs.ubuntu.com/changelogs/pool/' + ubuntu_component
> + '/' + app[:1] + '/' + app + '/' + app + '_' + ubuntu_version +
> '/changelog>Ubuntu Changelog</a>'
>                            debian_changelog = '<a
> href=http://packages.debian.org/changelogs/pool/' + 'main' + '/' +
> app[:1] + '/' + app + '/' + app + '_' + debian_fullversion +
> '/changelog>Debian Changelog</a>'
>
>                            print('cve: %s' % cve)
>                            for cveitem in cve:
>                                cvestatus, url = cvecheck(cveitem,
> ubuntu_series, ubuntu_version)
>                                print('cvestatus: "%s"' % cvestatus)
>                                if cvestatus == 'released' or
> cvestatus == 'dne' or cvestatus == 'not-affected':
>                                    pass
>                                else:
>                                    writeweb(date, matchtype, app,
> ubuntu_series, ubuntu_fullversion, debian_fullversion,
> ubuntu_changelog, debian_changelog, url, cveitem, cvestatus)
>

I'm not sure I fully understand this but you can put the break statement
anywhere so you can check whether or not you need to continue then do a
bunch of things before finally breaking out of the loop eg.

if "something good" == happened:
    # do stuff
    # do some more things
    break

HTH
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