使用Storyboard时出现以下警告: warning: Unsupported Configuration: Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:. 这个警告一般出现在你往 Storyboard 拖了一个控制器, 但是没有连线到, 就会提示,…
python gevent使用例子 from gevent.pool import Pool POOL_SIZE = 100 def process(func, param1_list, param2_list) stat = {} pool = Pool(POOL_SIZE) results = pool.imap_unordered(func, param1_list, param2_list) pool.join() # 处理结果 for value in results: stat.up…
使用Storyboard时出现以下警告: warning: Unsupported Configuration: Scene is unreachable due to lack of entry points and does not have an identifier for runtime access via -instantiateViewControllerWithIdentifier:. 大意是为了在程序中动态访问Scene,需要给其设置一个Storyboard ID,所以给出了…
Unsupported Configuration: “View Controller” is unreachable because it has no entry points, and no identifier for runtime access via -[UIStoryboard instantiateViewControllerWithIdentifier:]. 直译:不支持的设置:"View Controller"是不能被取到的,因为它没有程序入口指针,也没有标识符以…
61.打印出杨辉三角形. #python3.7 from sys import stdout if __name__ == '__main__': a = [] for i in range(10): a.append([]) for j in range(10): a[i].append(0) for i in range(10): a[i][0] = 1 a[i][i] = 1 for i in range(2,10): for j in range(1,i): a[i][j] = a[i…
55.学习使用按位取反~. 程序分析:~0=1; ~1=0; (1)先使a右移4位. (2)设置一个低4位全为1,其余全为0的数.可用~(~0<<4) (3)将上面二者进行&运算. #python3.7 if __name__ == '__main__': a = 234 b = ~a print('The a\'s 1 complement is %d' % b) a = ~a print('The a\'s 2 complement is %d' % a) 56.画图,学用circ…