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>>> {}.get('foo', 123)
123
>>> {}.get('foo') or 123
123
>>> {'foo': []}.get('foo', 123)
[]
>>> {'foo': []}.get('foo') or 123
123

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            [backgroundView addSubview:imageView];
            [backgroundView addSubview:[datasetView.subviews objectAtIndex:1]];


            imageView.layer.masksToBounds = YES;
            imageView.layer.cornerRadius = 15.;
            backgroundView.layer.shadowPath = [UIBezierPath bezierPathWithRoundedRect:imageView.bounds
                                                                         cornerRadius:15.].CGPath;
            backgroundView.layer.cornerRadius = 15.;
            backgroundView.layer.shadowColor = [[UIColor colorWithWhite:0.0 alpha:1.] CGColor];

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    UILabel *label = [UILabel new];
    label.text = locked ? @"🔒" : @"🔓";
    UIBarButtonItem *lockBtn = [[UIBarButtonItem alloc] initWithCustomView:label];
    lockBtn.tintColor = [UIColor redColor];
//    UIBarButtonItem *lockBtn = [[UIBarButtonItem alloc] initWithTitle:title
//                                                                style:UIBarButtonItemStyleBordered
//                                                               target:nil action:nil];
    NSMutableArray *rightBarButtonItems = [self.navigationItem.rightBarButtonItems mutableCopy];
    [rightBarButtonItems insertObject:lockBtn atIndex:0];
    self.navigationItem.rightBarButtonItems = rightBarButtonItems;

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2011-11-16 12:46:58.567 smile[53799:707] nested push animation can result in corrupted navigation bar
2011-11-16 12:46:58.829 smile[53799:707] Unbalanced calls to begin/end appearance transitions for <RenderingViewController: 0x46bc10>.
2011-11-16 12:46:59.136 smile[53799:707] Finishing up a navigation transition in an unexpected state. Navigation Bar subview tree might get corrupted.

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// EXC_BAD_ACCESS:

#0  0x35adfeda in objc_retain ()
#1  0x35aecbe4 in objc_retainAutoreleasedReturnValue ()
#2  0x0001165c in __block_global_2 (.block_descriptor=0xa9b08, tex1=0x438c60, tex2=0x337820) at /Users/dennda/dev/msc/pocs/Smile/Smile/Dataset.m:133
#3  0x3504174c in __CFSimpleMergeSort ()
#4  0x350417b4 in __CFSimpleMergeSort ()
#5  0x350417b4 in __CFSimpleMergeSort ()
#6  0x350417b4 in __CFSimpleMergeSort ()
#7  0x350417b4 in __CFSimpleMergeSort ()

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+ (NSURL*)getDatasetRootFolder {
    NSURL *appsupport = [[NSFileManager defaultManager] URLForDirectory:NSApplicationSupportDirectory
                                                               inDomain:NSUserDomainMask
                                                      appropriateForURL:nil
                                                                 create:YES
                                                                  error:nil];
    NSURL *root = [appsupport URLByAppendingPathComponent:@"datasets" isDirectory:YES];
    BOOL is_directory;
    BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:root.absoluteString
                                                       isDirectory:&is_directory];

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    // For some reason (maybe ARC?) this doesn't work:
    // [self.client respondToMessage:self];
    // But this still works...
    [self.client performSelector:@selector(respondToMessage:) withObject:self];

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bplist00‘
beT$topX$objectsX$versionY$archiver—aTrootÄ
§	
U$null‘f[message_key]arguments_key\response_keyV$classÄÄ

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#define MESSAGE_KEY @"message_key"
#define ARGUMENTS_KEY @"arguments_key"
#define RESPONSE_KEY @"response_key"

@implementation ...

@synthesize message=_message, arguments=_arguments, response=_response, client;

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];

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            UILabel *participants_label = [[UILabel alloc] init];
            participants_label.text = @"Current Participants:";
            participants_label.backgroundColor = [UIColor clearColor];
            participants_label.font = [UIFont systemFontOfSize:28.];
            [participants_label sizeToFit];
            return participants_label;