小编Peh*_*hat的帖子

我需要以渐进式JPEG格式显示图像(http://en.wikipedia.org/wiki/JPEG#JPEG_compression,不要与顺序JPEG的逐行显示混淆).Flash支持加载渐进式JPEG,但我不知道如何在加载过程中显示它.简短的谷歌搜索让我逐步加载顺序JPEG,没有别的.

考虑该文件sample.py包含以下代码:

from multiprocessing import Pool

def sample_worker(x):
    print "sample_worker processes item", x
    return x

def get_sample_sequence():
    for i in xrange(2,30):
        if i % 10 == 0:
            raise Exception('That sequence is corrupted!')
        yield i

if __name__ == "__main__":
    pool = Pool(24)
    try:
        for x in pool.imap_unordered(sample_worker, get_sample_sequence()):
            print "sample_worker returned value", x
    except:
        print "Outer exception caught!"
    pool.close()
    pool.join()
    print "done"

当我执行它时,我得到以下输出:

Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 810, in __bootstrap_inner
    self.run()
  File …

我有一些使用以下代码的故事:

#include <iostream>
#incldue <vector>

template <typename ElemType>
class A{
private:

  std::vector<ElemType> data;

public:
  A() {};

  A(int capacity) {
    data.reserve(capacity);
  }

  int GetCapacity() {
    return data.capacity();
  }
};

int main() {
  A<int> a;
  a = A<int>(5);
  std::cout << a.GetCapacity() << std::endl; 
} 

输出为0.可能是什么问题？

Triyng在Python 2.7中做到这一点:

>>> s = u"some\u2028text"
>>> s
u'some\u2028text'
>>> l = s.splitlines(True)
>>> l
[u'some\u2028', u'text']

\u2028是从左到右嵌入字符,而不是\r或\n,因此不应拆分该行.有错误还是只是我的误会？