小编zjm*_*126的帖子

class NavigableString(unicode, PageElement):

    def __new__(cls, value):
        if isinstance(value, unicode):
            return unicode.__new__(cls, value)
        return unicode.__new__(cls, value, DEFAULT_OUTPUT_ENCODING)

    def __getnewargs__(self):#this line
        return (NavigableString.__str__(self),)

为什么这个Django代码_在'has favicon'前面使用

has_favicon = models.BooleanField(_('has favicon'))

我认为你可以在一个类中定义' __init__'或' __new__',但为什么在django.utils.datastructures.py中定义了所有.

我的代码:

class a(object):
    def __init__(self):
        print  'aaa'
    def __new__(self):
        print 'sss'

a()#print 'sss'

class b:
    def __init__(self):
        print  'aaa'
    def __new__(self):
        print 'sss'
b()#print 'aaa'

datastructures.py:

class SortedDict(dict):
    """
    A dictionary that keeps its keys in the order in which they're inserted.
    """
    def __new__(cls, *args, **kwargs):
        instance = super(SortedDict, cls).__new__(cls, *args, **kwargs)
        instance.keyOrder = []
        return instance

    def __init__(self, data=None):
        if data is None:
            data = {}
        super(SortedDict, self).__init__(data)
        if isinstance(data, dict):
            self.keyOrder = …

我的代码是:你好!~~~

{% if user %}
    <p>Logged in as {{ user.first_name }} {{ user.last_name }}.</p>
{% elif openid_user%}
    <p>Hello, {{openid_user.nickname}}! Do you want to <a href="{{openid_logout_url}}">Log out?</p>
{% else %}
    <p><a href="/login?redirect={{ current_url }}">google Log in</a>.</p>
    <p><a href="/twitter">twitter Log in</a>.</p>
    <p><a href="/facebook">facebook Log in</a>.</p>
    <p><a href="{{openid_login_url}}">openid Log in</a>.</p>
    <iframe src="/_openid/login?continue=/"></iframe>
{% endif %}

错误是:

TemplateSyntaxError: Invalid block tag: 'elif'

webapp没有'else if'吗？

谢谢

import itertools
print itertools#ok

代码还可以

但我找不到itertools文件.

谁能告诉我'itertools文件'在哪里

我的代码运行python2.5

import itertools
print itertools.__file__


Traceback (most recent call last):
  File "D:\zjm_code\mysite\zjmbooks\a.py", line 5, in <module>
    print itertools.__file__
AttributeError: 'module' object has no attribute '__file__'

maps = (maps.filter(name__icontains=search_terms) |
            maps.filter(description__icontains=search_terms))

我找不到这个过滤器.

谢谢

这是我的代码:

<script type="text/javascript">
var Note=function(){}
Note.prototype = {
    get id()
    {
        if (!("_id" in this))
            this._id = 0;
        return this._id;
    },

    set id(x)
    {
        this._id = x;
    }
}

var a=new Note()
alert(a.id)
</script>

这种风格就像是python,

这是我第一次看到这段代码,

你能不能给我更多关于javascript中'get'和'set'的例子.

谢谢

可能重复:
<if name ==" main ":>做什么？

考虑以下代码:

if __name__ == '__main__':
    import pdb
    pdb.run("interact()\n")

以下行是什么意思？

if(__name__=='__main__')

我昏了过去.

我想在JavaScript中转义一些HTML.我怎样才能做到这一点？

这是我的代码:

a = \
'''def fun():\n
    print 'bbb'
'''
eval(a)

fun()

但它显示错误:

Traceback (most recent call last):
  File "c.py", line 8, in <module>
    eval(a)
  File "<string>", line 1
    def fun():
      ^
SyntaxError: invalid syntax

那我该怎么办

谢谢