小编Aam*_*nan的帖子

我从存储为的数据库中提取名称myname.我如何在Django模板中显示这个Myname,第一个字母是大写的.

请帮助我根据功能的不同来澄清这两个python语句的概念:

1. sys.exit(0)

2. os._exit(0)

环境细节:

Server: Amazon ec2 Linux
Web Server: Apache
Web Framework: Django with mod_wsgi

以下我在mysql_err.log文件中找到了.

The InnoDB memory heap is disabled
120823  3:21:40 InnoDB: Mutexes and rw_locks use GCC atomic builtins
120823  3:21:40 InnoDB: Compressed tables use zlib 1.2.3
120823  3:21:40 InnoDB: Using Linux native AIO
120823  3:21:41 InnoDB: Initializing buffer pool, size = 128.0M
InnoDB: mmap(137363456 bytes) failed; errno 12
120823  3:21:41 InnoDB: Completed initialization of buffer pool
120823  3:21:41 InnoDB: Fatal error: cannot allocate memory for the buffer pool …

我生成所有可能的三个字母关键字e.g. aaa, aab, aac.... zzy, zzz下面是我的代码:

alphabets = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']

keywords = []
for alpha1 in alphabets:
    for alpha2 in alphabets:
        for alpha3 in alphabets:
            keywords.append(alpha1+alpha2+alpha3)

能否以更加流畅有效的方式实现此功能？

有没有办法知道.pyc文件编译的哪个Python版本？

我正在尝试POST一个新的嵌套对象,问题只是创建"顶部"对象(播放列表),但不要创建"ChannelItem"...

我的模特:

class Playlist(models.Model):
    provider = models.IntegerField()
    channel_id = models.CharField(max_length=100)
    channel_version = models.CharField(blank=True, max_length=100)
    start = models.DateTimeField()
    url = models.CharField(max_length=500)


class ChannelItem(models.Model):
    playlist = models.ForeignKey(Playlist, editable=False, related_name='channelitems')
    content_id = models.CharField(max_length=100)
    content_version = models.CharField(blank=True, max_length=100)

我的序列化器:

class ChannelItemSerializer(serializers.ModelSerializer):
    class Meta:
        model = ChannelItem
        fields = ('content_id', 'content_version')
        exclude = ('id')
        depth = 1


class PlaylistSerializer(serializers.ModelSerializer):

    class Meta:
        model = Playlist
        fields = ('id', 'provider', 'channel_id', 'channel_version', 'start', 
                  'url', 'channelitems')
        depth = 2

channelitems = ChannelItemSerializer()

我使用curl发布以下数据:

'{"provider":125,"channel_id":"xyz", "channel_version":"xsqt", 
"start":"2012-12-17T11:04:35","url":"http://192.168.1.83:8080/maaaaa",
"channelitems":[{"content_id":"0.flv", "content_version":"ss"}, …

我看到人们一直在做的事情是:

class Man(object):
    def say_hi(self):
        print('Hello, World.')

class ExcitingMan(Man):
    def say_hi(self):
        print('Wow!')
        super(ExcitingMan, self).say_hi()  # Calling the parent version once done with custom stuff.

我从未见过的人做的事情是:

class Man(object):
    def say_hi(self):
        print('Hello, World.')

class ExcitingMan(Man):
    def say_hi(self):
        print('Wow!')
        return super(ExcitingMan, self).say_hi()  # Returning the value of the call, so as to fulfill the parent class's contract.

这是因为我和所有错误的程序员挂在一起,还是有充分的理由呢？

我一直在努力找到将文档转换为doc,docx,ppt,pptx到pdf的有效方法.到目前为止,我已经试过docsplit和oowriter,但都采取> 10秒完成任务的pptx文件有大小1.7MB.任何人都可以建议我改进方法的更好方法或建议吗？

我尝试过的:

from subprocess import Popen, PIPE
import time

def convert(src, dst):
    d = {'src': src, 'dst': dst}
    commands = [
        '/usr/bin/docsplit pdf --output %(dst)s %(src)s' % d,
        'oowriter --headless -convert-to pdf:writer_pdf_Export %(dst)s %(src)s' % d,
    ]

    for i in range(len(commands)):
        command = commands[i]
        st = time.time()
        process = Popen(command, stdout=PIPE, stderr=PIPE, shell=True) # I am aware of consequences of using `shell=True` 
        out, err = process.communicate()
        errcode = process.returncode
        if errcode != 0: …

我试图将html实体转换为unichar,html实体是󮠖 当我尝试执行以下操作时:

unichr(int(976918))

我得到的错误是:

ValueError: unichr() arg not in range(0x10000) (narrow Python build)

似乎它超出了unichar的范围转换.

我有两个模型,命名为Human和Animal.Human的主键是Animal模型中的外键.两者各有3列.人体模型有c,e,r列.动物模型有l,i,p列.我在人体模型上运行django查询,就像这样.

result = Human.objects.filter().order_by('r')

result是一个queryset对象.此对象从我的视图文件发送到django模板页面.在模板页面内部,我循环result并显示列值.

现在我想做的是,我想p在同一个循环内,在django模板中获取列的值(它存在于Animal模型中).我们怎么能在django模板页面中做到这一点.

在python文件中,我可以这样做

for i in result:
    print i.animal_set.values()[0]['p']

但我想在模板页面中这样做.